Question

A constant force of 50N is applied on a body of mass 20kg moving initially with a speed of 15m/s. How long does the body take to stop?

Answer 1

Answer:

“good speed of 15m/s”???

Retardation (a) = F/m

= 50/20

= 2.5 m/s^2

Now, use v = u + at

0 = 15 + (-2.5)t

t = 15/2.5

t = 6 seconds

It takes 6s for body to stop.

Answer 2

Answer:

Acceleration a =  Force/mass

=50/20

=2.5 m/s²

Putting in v = u - at  

0 = 15 - (2.5)t

2.5 t = 15

t = 6 s

It will take 6s to the body to come at rest.

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