A train accelerates from 36 km/h to 54 km/h in 10 sec.
(ii) The distance travelled by car.
A body whose speed is constant
(a) Must be accelerated
(b) Might be accelerated
(c) Has a constant velocity
(d) Cannot be accelerated.
A truck travelling at 54 km/h is slow down to 36 km/h in 10 sec. Find the retardation
A particle is moving in a circle of diameter 20 m. What is its distance and as per the table given below
A scooter travelling at 10 m/s speed up to 20 m/s in 4 sec. Find the acceleration of scooter.
A train starts from rest and accelerate uniformly at the rate of 5 m/s2
for 5 sec.
Calculate the velocity of train in 5 sec.
A object moves with uniform positive acceleration. Its velocity-time graph will be
(a) A straight line parallel to the time axis
(b) A straight line inclined at an obtuse angle to the time axis
(c) A straight line inclined at an acute angle to the time axis
(d) None of these.
The maximum speed of a train is 90 km/h. It takes 10 hours to cover a distance of 500 km.
Find the ratio of its average speed to maximum speed?
A car start from rest and acquire a velocity of 54 km/h in 2 sec. Find
(i) the acceleration
(ii) distance travelled by car assume motion of car is uniform?
An object dropped from a cliff falls with a constant acceleration of 10 m/s2
. Find its speed 5 s after it was dropped.
A ball is thrown upwards and it goes to the height 100 m and comes down
1) What is the net displacement?
2) What is the net distance?
Practice questions on motion
Two cars A and B race each other. The Car A ran for 2 minute at a speed of 7.5 km/h, slept for 56 minute and again ran for 2 minute at a speed of 7.5 km/h.
find the average speed of the car A in the race.
Anand leaves his house at 8.30 A.M for his school. The school is 2 km away and classes start at 9.00 A.M. If he walks at a speed of 3 km/h for the first kilometre, at what speed should he walk the second kilometre to reach just in time?
An object moves along a straight line with an acceleration of 2 m/s2
. If its initial speed is 10 m/s, what will be its speed 2 s later?
A bullet hits a Sand box with a velocity of 20 m/s and penetrates it up to a distance of 6 cm. Find the deceleration of the bullet in the sand box.
A particle experiences constant acceleration for 20 seconds after starting from rest.
If it travels a distance D1
in the first 10 seconds and distance D2
in the next 10 seconds then,
The velocity -time graph of SUV is given below. The mass of the SUV is 1000 kg.
a. What is the distance travelled by the SUV is first 2 seconds?
b. What is the braking force at the end of 5 seconds to bring the SUV to a stop within one seconds?
An electron moving with a velocity of $5 \times 10^3 m/s$ enters into a uniform electric field and acquires a uniform acceleration of $10^3 m/s^2$ in the direction of initial velocity.
i. Find out the time in which electron velocity will be doubled.?
ii. How much distance electron would cover in this time.?
A train 100 m long is moving with the velocity of 72 km/hr. Find the time it takes to cross the bridge which is 2 km long?
An artificial satellite is moving in a circular orbit of radius 42.250 km (approx). Calculate its linear velocity if takes 24 hour to revolve around earth.?
The velocity-time graph shows the motion of a cyclist. Find
(i) its acceleration
(ii) its velocity
(iii) the distance covered by the cyclist in 15 seconds
An object starting from rest travels 20 m in first 2 s and 160 m in next 4 s.What will be the velocity after 7 s from the start.
An object travels 20 m in 2 s and then another 16 m in 2 s. What is the average speed of the object?
The distance moved and the magnitude of displacement are equal in ?
(a) The earth is revolving around the Sun
(b) Object moving in circular path
(c) The pendulum is moving to and fro
(d) Object moving on straight road
Stopping distance of vehicles : When brakes are applied to a moving vehicle, the distance it travels before stopping is called stopping distance. It is
an important factor for road safety and depends on the initial velocity ($v_0$) and the braking capacity, or deceleration, ?a that is caused by the braking.
A car travelling at speed 72km/hr suddenly applies the brake with the deceleration of 5m/s2
. Find the stopping distance of the car
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Class 9 Maths
Class 9 Science