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March 29, 2015

March 29, 2015

Posted by **Clarissa** on Sunday, April 22, 2012 at 6:44pm.

At serve, a tennis player aims to hit the ball horizontally.

part a)What minimum speed is required for the ball to clear the 0.90m--high net about 15.0m from the server if the ball is "launched" from a height of 2.50m ?

part b)here (relative to server) will the ball land if it just clears the net?

part c)Will it be "good" in the sense that it lands within 7.0m of the net? yes or no ?

part d) How long will it be in the air?

- @damon -
**Damon**, Sunday, April 22, 2012 at 6:51pmI continued down below, scroll again

Do you agree on the first answer? the horizontal speed?

- @damon -
**Clarissa**, Sunday, April 22, 2012 at 6:56pmyeah i got 26.3 because i round it off for the speed

- @damon all worked out -
**Damon**, Sunday, April 22, 2012 at 6:58pmAt serve, a tennis player aims to hit the ball horizontally.

part a)What minimum speed is required for the ball to clear the 0.90m--high net about 15.0m from the server if the ball is "launched" from a height of 2.50m ?

part b)here (relative to server) will the ball land if it just clears the net?

part c)Will it be "good" in the sense that it lands within 7.0m of the net? yes or no ?

part d) How long will it be in the air?

======================

u = 26.25 until it hits ground

how long to fall 2.5 m?

2.5 = 4.9 t^2

t =.714 second to hit ground

where will it be?

26.25 * .714 = 18.74 total horizontal dist

18.74 - 15 = 3.74 into opposite side, good shot

time in air was .714 s

- @damon -
**Clarissa**, Sunday, April 22, 2012 at 7:10pmthank you, I will calculate everything again and see where I made my mistakes and compare it to these answers. Thanks alot really appreciate it

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