Question

A 2kg mass moving at a speed of 3 m/s is stopped by a constant force of 15N. How many seconds must the force act on the mass to stop it.

Answer 1

t = 0.4 seconds

Step-by-step explanation:

Given that,

Mass of the object, m = 2 kg

Initial speed of the object, u = 3 m/s

Finally, it stops, v = 0

Constant force applied to the object, F = 15 N

We know that,

Force, F = ma

`F=(m(v-u))/(t)\\\\t=(m(v-u))/(F)\\\\t=(2* (0-3))/(15)\\\\=0.4\ s`

So, it will take 0.4 seconds to stop the mass.