Motion in a Str...

A body A starts from rest with an acceleration a₁ . After 2 seconds, another body B starts from rest with an acceleration a₂. If they travel equal distances in the 5th second, after the start of A, then the ratio a₁ : a₂ is equal to

The velocity of a bullet is reduced from 200 m/s to 100 m/s while travelling through a wooden block of thickness 10 cm. The retardation, assuming it to be uniform, will be

A body of 5 kg is moving with a velocity of 20 m/s. If a force of 100 N is applied on it for 10 s in the same direction as its velocity, what will now be the velocity of the body

A particle starts from rest, accelerates at 2 m/s² for 10 s and then goes with constant speed for 30 s and then decelerates at 4 m/s² till it stops. What is the distance travelled by it

The engine of a motorcycle can product a maximum acceleration 5 m/s². Its brakes can produce a maximum retardation 10 m/s². What is the minimum time in which it can cover a distance of 1.5 km

The path of a particle moving under the influence of a force fixed in magnitude and direction is

A particle moves a distance x in time t according to equation x = (t + 5)^–1. The acceleration of particle is proportional to

A body travelling with uniform acceleration crosses two points A and B with velocities 20 ms^–1 and 30 ms^–1 and respectively. The speed of the body at the mid-point of A and B is nearest to

Select the incorrect statements from the following
S1: Average velocity is path length divide by time interval.
S2 : In general, speed is greater than the magnitude of the velocity.
S3 : A particle moving in a given direction with a non-zero velocity can have zero speed.
S4: The magnitude of average velocity is the averagespeed.