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:
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!!