Question

A train is moving along the tracks at a constant speed u. A girl on the train throws a ball of mass m straight ahead along the direction of motion of the train with speed v with respect to herself. Then,

• A. The kinetic energy of the ball as measured by the girl on the train is \(\frac{mv^2}{2}\)
• B. work done by the girl in throwing the ball is \(\frac{mv^2}{2}\).
• C. Work done by the train mvu
• D. The gain is the kinetic energy of the ball as measured by a person standing by the rail track is \(\frac{mv^2}{2}\).

Answer 1

The Correct Option is A, B, C

The correct answer is/are option(s):
(A): The kinetic energy of the ball as measured by the girl on the train is \(\frac{mv^2}{2}\)
(B): work done by the girl in throwing the ball is \(\frac{mv^2}{2}\).
(C): Work done by the train mvu