Question

Q7. A truck travelling at 25 m/s puts its brakes on for 4s. This produces a retardation of 2 m/s2. What does the trucks velocity drop to?

Answer 1

Answer:

Hence, the required velocity drop = 17 m/sec

Explanation:

Given Data:

1. Acceleration = a = -2m/s^2 (retardation)

2. Time taken = t = 4s

3. Initial velocity = u = 25m/s

4. final velocity = ?

Formula and Calculations:

v = u + at

putting the values, we get,

v = 25 + (-2) × 4

v = 25 - 8

v = 17m/s (required answer)

Hence, the required velocity drop = 17 m/sec