Question

a train is moving with an initial velocity of 60m/s.The brakes are applied so as to produce a uniform acceleration of - 1.5m/s.Calculate the time taken in which it will come to rest ​

Answer 1

Answer:

Let t be the time in seconds from the beginning of the motion of a particle. If the particle has a velocity of 4 m/s initially (at t=0) and has a constant acceleration of 2 m/s2, find the velocity of the particle:

when t=1

when t=2

after t seconds.

Draw the velocity–time graph for the motion.

Solution

When t=1, the velocity of the particle is 4+2=6 m/s.

When t=2, the velocity of the particle is 4+2×2=8 m/s.

After t seconds, the velocity of the particle is 4+2t m/s.

Explanation: