Question

If the change in kinetic energy of a tennis ball hit by the racket
is 29), and the average force that the racket exerts on the ball
is 80. N, what is the distance that the force is exerted over?

Answer 1

Answer: .36 m

Explanation:

Answer 2

The distance that the force is exerted over is equal to 0.3625 meter.

Given the following data:

• Change in kinetic energy = 29 Joules.

• Average force = 80 Newton

To calculate the distance that the force is exerted over, we would apply the law of conservation of energy.

The law of conservation of energy.

According to the law of conservation of energy, the work done by an external force equals the change in kinetic energy for the motion of the tennis ball hit by the racket.

Mathematically, this is given by this expression:

$Work\;done = \Delta K.E = Fd$

Where:

• F is the force.

• d is the distance.

Substituting the given parameters into the formula, we have;

$29 = 80 \times d\\\\d=\frac{29}{80}$

Distance, d = 0.3625 meter.

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