A ball of mass is released from rest near Earth's surface
PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
A ball of mass m is released from rest near Earth's surface. Air resistance is negligible. Which statement best describes the force exerted on Earth by the ball while the ball is falling?
(a) Its magnitude is much smaller than mg because Earth’s mass is enormous compared with m.
(b) Its magnitude is mg and it is directed upward toward the ball.
(c) Its magnitude is mg and it is directed downward toward Earth’s center.
(d) It is zero because Earth’s acceleration is negligible.