A boy throws a steel ball straight up. Consider the motion of the ball only afte
ID: 2269782 • Letter: A
Question
A boy throws a steel ball straight up. Consider the motion of the ball only after it has left the boy's hand but before it touches the ground, ans assume that the forces exerted by the air are negligible. For these conditions, the force(s) acting on the ball is (are):
a steadily decreasing upward force from the moment it leaves the boy's hand until it reaches its highest 1) on the way down there is a steadily increasing downward force of gravity as the object gets closer to the earth.2) an almost constant downward force of gravity only. 3) a downward force of gravity along with a steadily decreasing upward force.4)one of the other answers. The ball falls back to ground because of its natural tendency to rest on the surface of the earth.5) an almost constant downward force of gravity along with an upward force that steadily decreases until the ball reaches it highest point; on the way down there is only a constant downward force of gravity.
Explanation / Answer
The moment the ball leaves the hand of the boy, only gravity is acting on the ball along with the initial velocity given to the ball by the boy.
The initial velocity doesn't amount to any force but is rather converted into kinetic energy and is nullified by the work done by the gravitational force.
Hence, only an almost constant downward force of gravity is acting on the ball.
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