11) A 6.0 x 105 kg space probe is traveling at speed vo through deep space. Retr

Question

11) A 6.0 x 105 kg space probe is traveling at speed vo through deep space. Retrorockets are fired to slow down the probe and they generate a force of 1.6 x 106 N over a distance of 3000 km.
The final speed of the probe is found to be 3.0 x 103 m/s. Calculate the (initial) speed vo .

a. 5000 m/s
b. 2897 m/s
c. 4532 m/s
d. 1875 m/s
e. 3871 m/s

12) In being served, a tennis ball is accelerated from rest to a speed of 50.0 m/s. The average power generated during the serve is 2525 W. Assuming that the acceleration of the ball is constant during the serve, find the force acting on the ball.

a. 200 N
b. 250 N
c. 130 N
d. 101 N
e. 500 N

Explanation / Answer

11) F = m*a 1.6*10^6 = 6*10^5 * a a = 1.6*10^6 / (6*10^5) vf^2 = vi^2 + 2* a*X (3.0*10^3)^2 = vi^2 +2*1.6*10^6 / (6*10^5)*3000 vi = 2997.33

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