Question

An object of mass 20kg moving
with a velocity
of
10m/s is brough to rest ofter 2 secs.
Its acceleration is​

Answer 1

u, initial velocity=10m/s

m=20kg

t=2s

v, final velocity=0

a=v-u/t or v = u + at

a= -10/2 ===> -5m/s^2

- ve sign shows Acceleration is in opposite direction.

F= MA==20x -5= -100N