Homework Help: Physics university

Posted by Jessica on Monday, October 12, 2009 at 11:01pm.

In a tennis match, a player wins a point by hitting the ball sharply to the ground on the opponent's side of the net.

If the ball bounces upward from the ground with a speed of 17 m/s , and is caught by a fan in the stands with a speed of 12 m/s , how high above the court is the fan? Ignore air resistance.

?

Explain why it is not necessary to know the mass of the tennis ball.

Physics university - bobpursley, Monday, October 12, 2009 at 11:04pm
the total energy is the same.

PE + KE= constant
mgh+ 1/2 mv^2=constant

now when h is zero(at the ground) v is 17m/s
so term one mgh and term 2 KE act in opposite direction (when one goes up 10, the other goes down 10)
Since velocity was given, it is not necessary to know mass.
Physics university - Leah, Tuesday, October 13, 2009 at 3:43am
ugh confused

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