Question

A motorcycle is being driven at a speed of 20 m/s when brakes are applied to bring it to rest in five seconds. The deceleration produced in this case will be :

Options

• + 4 m/s²

• − 4 m/s²

• + 0.25 m/s²

• −0.25 m/s²

Answer 1

We have,
Initial velocity = 20 m/s
Final velocity = 0 m/s
Time taken = 5 sec.
So,
Deceleration = – Acceleration
= –(0 – 20)/5
= 4 m/s²
So, the answer is + 4 m/s²