Question

A motorbike running at 90km/h in 25s. Calculate i)acceleration ii) Retardation.

Answer 1

Answer:

Acceleration is 1 m/s^2

Retardation is -1 m/s^2

Explanation:

First case

1. initial velocity = 0 m/s
2. final velocity = 25 m/s
3. time taken = 25 sec

• v = u + at
• 25 = a 25
• a = 1 m/s^2

Seconde case

1. initial velocity = 25 m/s
2. final velocity = 0 m/s
3. time taken = 25 sec

• v = u + at
• 0 = 25 + a × 25
• a = -1 m/s^2