Proj Motion EX 5

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Helena Dedic

A tennis ball is served at a height of 2.4 m at 30 m/s in the horizontal direction. The net is 0.9 m high at a horizontal distance of 12 m. Does the ball clear the net? If so, by how much? If not, where does it strike the net? < br>br>

Solution:

TOP

Knowing that the ball travels a horizontal distance of 12 m to the net, and knowing the initial velocity, we can calculate the time it takes from eq'n 1:


 


 


t = 12 m / 30 m/s = 0.4 s 
 


 


 


y = 2.4 m - 0.784 m = 1.616 m 


The tennis ball clears the net!!