#### Question

How long will it take a force of 10 N to stop a mass of 2.5 kg which is moving at 20 m/s ?

#### Solution

We are going to find acceleration

Force = mass × acceleration

`10 = 2.5 xx a`

⇒ `10/2.5 = a`

⇒ `(10 xx 10)/(2.5 xx 10) = a`

⇒ a = 4

Now , putting these values in the equation :

`v = u + at`

⇒ `20 = 0 + 4 xx t`

⇒ 20 = 4t

⇒ `20/4 = t`

⇒ `t = 5s`

Is there an error in this question or solution?

Solution How Long Will It Take a Force of 10 N to Stop a Mass of 2.5 Kg Which is Moving at 20 M/S ? Concept: Second Law of Motion.