The speed of a tennis ball that is served is 73.14 m/s. during a serve, the ball typically starts from rest and is in contact with the tennis racquet for 30 milliseconds. assuming constant acceleration, what is the average force exerted on the tennis ball during the serve, expressed in terms of the ball’s weight w? 450w 150w 250w 350w

Third option

F = 250w

Explanation:

The impulse can be written as the product of force for the time interval in which it is applied.

You can also write impulse I as the change of the linear momentum of the ball

So:

We want to find the force applied to the ball. We know that

milliseconds = 0.03 seconds

The initial velocity is zero.

The final speed

So

We must express the result of the force in terms of the weight of the ball.

We divide the expression between the acceleration of gravity

The answer is the third option

electrical potential energy =0.072 j

explanation:

electrical potential energy is given by

u= q δv

q= charge=6 c

δv= potential difference and is given by

δv= e d

e= electric field

d= distance=5 mm=0.005 m

δv=2.4 (0.005)=0.012 v

now electric potential energy= u= q δv

u=6 (0.012)

u=0.072 j