Question

A ball initially moving at a speed of 25m/s is acted upon a constant retardation of 2.5m/s². For how long will the ball roll before coming to rest

Answer 1

Answer:

Initial velocity of ball = 25 m/s , acceleration(a) = -2.5 m/s2 , final velocity =0

using equation of motion formula

v =u +at

0 = 25 -2.5 x t

2.5t =25

t = 25/2.5 = 10seconds

Answer 2

Answer:

Initial velocity of ball = 25 m/s , acceleration(a) = -2.5 m/s2 , final velocity =0

using equation of motion formula

v =u +at

0 = 25 -2.5 x t

2.5t =25

t = 25/2.5 = 10seconds

Explanation: