Question

A car moving at 60 ms–1 is caused to stop in 3s. Its average deceleration in ms–2 is [ ] a) – 20 b) 21 c) 20 d) – 21

Answer 1

V=0 as the car stops in 3sec

u=60 m/s

t=3 sec

Decceleration mean s negative acceleration (-a)

V=u-at

U=-at

-a=60/3

a=-20 m/s2

I hope this helps ( ╹▽╹ )

Answer 2

Answer:

answer is option (a)

Explanation: