Question

A car travels with a uniform velocity of 20m/s for 5s.The brakes are then applied and it is uniformly retarded and comes to rest in further 8s.Calculate (i)Distance travelled in the first 5s.(ii) Distance travelled in the last 8s.(iii)acceleration during first 5s and the last 8s.​

Answer 1

Answer:

Time = 8seconds

(i) Distance covered in first 5 seconds

Since Body moved with uniform motion, this means that acceleration =0

So,From 2nd equation of motion :-

(ii) Distance covered after breaks are applied :-

U= 20 m/sec

V = 0 m/sec

T = 8 second

So,

So,

(iii) Total Distance travelled

(iv)

Acceleration during 1st 5 seconds = 0m/sec²

Acceleration during last 8 seconds = (-2.5)m/sec²