Dan and Nancy stand at the edge of a 100 m high cliff on Mars. Dan extends his a

Question

Dan and Nancy stand at the edge of a 100 m high cliff on Mars. Dan extends his arm over the cliff edge and throws a ball straight up with an initial speed of 10 m/s. Nancy throws an identical ball with the same initial speed, but she throws the ball at a 40 degree angle above the horizontal.

Consider each ball at the highest point in its flight. At this point which ball has the greater vertical velocity? Explain your answer briefly.

Consider each ball at the highest point in its flight. At this point which ball has the greater horizontal velocity? Explain your answer briefly.

Explanation / Answer

A)
at the highest point in its flight,

both balls have zero vertical velocity.

we know as the balls move up their vertical velocities decreases due to earth attractive force towards down.

so, at highest point vertical velocity becomes zero for either of the balls.

B) at the highest point in its flight,

ball thrown by Nancy has greater horizontal velocity.

because it has initial horizontal velcoity component which remainse same through out te motion since there no net force in horizontal direction.

the horizontal component of ball thrown by Dan is zero through out the motion since it is projected vertically.

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