Question

When a body moving with a speed of 20m/s stops in 20s what is its acceleration?

Answer 1

Initial velocity,u=20 m/s

Final velocity,v=0 m/s

Time taken=20 s

Acceleration=(v-u)/t

=(0-20)/20

=-20/20

=-1 m/s

Answer=-1 m/s

Answer 2

Answer:

-1 m/s²

Explanation:

Acceleration, a = (v - u)/t

Here,

v = 0 m/s (The object comes to rest)

u = 20 m/s ( Given)

t = 20 s

So, a = (0 - 20 m/s)

20 s

= -1 m/s²