Question

a constant rereading force 50 n is supplied to a body of 70 kg moving initially with the speed of 15 m/s .how long does the body take to stop​

Answer 1

Answer:

It will take 21.12 seconds for the body to take to stop.

Explanation:

Given,

A constant rereading force 50 N is supplied to a body of 70 kg moving initially with the speed of 15 m/s.

To find: how long does the body take to stop​

Solution:

From Newton's second law,

Force = mass * acceleration

here, F = 50 N , m = 70 kg

On substituting the values,

50 = 70 * a

a = 50 / 70 = - 0.71 m/s² (as body is retarding)

Now, from first equation of motion,

v = u + at

here, v = 0 since the body is retarding. a = 0.71 m/s² and u = 15 m/s

Substituting the values,

0 = 15 + (-0.71)t

t = 15 / 0.71

t = 21.12 seconds

Therefore, It will take 21.12 seconds for the body to take to stop.