Question

A train accelerating uniformly from rest attains a maximum speed of \(40 \text{ m s}^{-1}\) in 20 s. It travels at this speed for 20 s and is brought to rest with uniform retardation in further 40 s. What is the average velocity during the period?

• A. \(80 \text{ m s}^{-1}\)
• B. \(25 \text{ m s}^{-1}\)
• C. \(40 \text{ m s}^{-1}\)
• D. \(30 \text{ m s}^{-1}\)

Hint:

For motion with varying speeds, average velocity is total displacement divided by total time.

Answer 1

The Correct Option is B