Question

a constant regarding force of 60N is applied to a body of mass 20Kg moving initially with a speed of 15m/s. how long does the body take to stop?
(a) 50sec
(b) 5sec
(c) 0.5 sec
(d) 10 sec​

Answer 1

b) 5sec

Explanation

Here.

F = 60N, m = 20kg, u = 15ms ¹, v = 0, t = ?

F = ma

a = f/m

= 60/20

= 3ms

v = u + at

t = 15/3

t = 5 second