please help with clear instructions. exam in the morning. 5. A person pulls is 3

Question

please help with clear instructions. exam in the morning.

5. A person pulls is 37° above horiz the snow without fr m/s2? 3. A tennis player is hitting a 58 gram tennis ball back across the net. When the racquet and the ball first make contact, the ball is moving at 30 m/s 15° below the positive x-axis. When the ball leaves the racquet, it is moving at 40 m/s 15° above the negative x-axis. If the ball is in contact with the racquet for 0.08 s, what is the average net force acting on the tennis ball while it is in contact with the racquet? A. 102 N B. 125 N C. 7.25 N A. 10.7 m/s2 B. 39.8 m/s2 C. 1.76 m/s2 D. 2.21 m/s2 E. 2.93 m/s2 E. 50.8 N

Explanation / Answer

Change in x momentum = m* delta Vx = 0.058* (40 cos 15 degree - - 30 cos 15 degree) = 3.922 kgm/s

Change in y momentum = 0.058*( 40 sin 15 degree - - 30 sin 15 degree) = 1.051 kg m/s

Net momentum change= sqrt (3.922^2 +1.051^2) = 4.06 kgm/s

Average force = 4.06/0.08

= 50.8 N

answer Option E is correct

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