The lob in tennis is an effective tactic when your opponent is near the net. It consists of lofting the ball over his head, forcing him to move quickl

aflacatn

aflacatn

Answered question

2021-02-25

When your opponent is close to the net, the lob is a good tennis strategy. By hoisting the ball over his head, you can make him sprint away from the goal. Assume you loft the ball at a 50.0-degree angle above the horizontal with an initial speed of 15.0 meters per second. Your opponent is currently 10.0 meters away from the ball.

Answer & Explanation

Khribechy

Khribechy

Skilled2021-02-26Added 100 answers

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The components of the velocity are voy=vosin50=15sin50=11.5 ms
v=vocos50=9.64 ms The time taken by the ball to reach the point P ' is
S=voyt(12)>2
0r2.10=11.5t(12)(9.8)t2
4.9t211.5t+2.1=0
This Quadractic equation in t, is solved for the values of t
t=2.15 s and 0.2 s
as the opponent begins to move only after 0.3s later, we taket = 2.15s
Therefore, he catches the ball at time t'=(2.15-0.3)s
The total horizontal distance
x=vt
(10+x)=v2.15s
=9.642.15
The value of ' x ' is calculated.
Thus the required speed of the opponent v=xt

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