Question

Martin rides his motorcycle at 20 m/s. suddenly he sees a row of stones

blocking the road 170 m ahead. He applies the brakes and the motorcycle is
decelerated at 2 m/s?. Justify will he be able to stop in time?
​

Answer 1

Answer: Yes

Step-by-step explanation:

Given

Martin initial speed is
`u=20\ m/s`

Stones is at 170 m ahead

Deceleration
`a=2\ m/s^2`

Using the equation of motion
`v^2-u^2=2as`

Insert the values

`0-20^2=2* (-2)s\\s=(400)/(4)\\\\s=100\ m`

So, it took 100 m to stop completely. Hence martin will be able to stop in time.