A ball is fired by a cannon from the top of a cliff as shown in the figure below

Question

A ball is fired by a cannon from the top of a cliff as shown in the figure below. Which of the paths would the cannon ball most closely follow? 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, and assume that forces exerted by the air are negligible. For these conditions, the force(s) acting on the ball is (are): (A) a downward force of gravity along with a steadily decreasing upward force. (B) a steadily decreasing upward force from the moment it leaves the boy's hand until it reaches its highest point: on the way down there is a steadily increasing downward force of gravity as the object gets closer to the earth. (C) an almost constant downward force of gravity along with an upward force that steadily decreases until the ball reaches its highest point: on the way down there is only a constant downward force of gravity. (D) an almost constant downward force of gravity only. (E) none of the above. The ball falls back to ground because of its natural tendency to rest on the surface of the earth. A bowling ball accidentally falls out of the cargo bay of an airliner as it flies along in a horizontal direction. middot As observed by a person standing on the ground and viewing the plane as in the figure at right, which path would the bowling ball most closely follow after leaving the airplane?

Explanation / Answer

12. it must be parabolic. so correct answer is B

13. D as only gravity acts on it

14. D because it is travelling with horizontal velocity and gravity will make its path parabolic

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