5. A golf ball (m 45 g) sitting at rest on a tee is hit by a golf club. The club

Question

5. A golf ball (m 45 g) sitting at rest on a tee is hit by a golf club. The club is in contact with the ball for 5.0 ms, and the ball's final speed is 58 m/s. a. What is the total impulse received by the ball? A. 2.6 kg m/s B. 3.4 kgm/s C. 4.9 kg m/s D. 6.1 kg m/s E. 7.2 kg m/s b. What is the average force of the club on the ball while they are in contact? A. 430 N B. 520 N C. 640 N D. 780 N E. 900 N c. What is the average force of the ball on the club during the same time interval? 6. A toy car (1-250 g) can travel along a straight track, defined along the x-axis. The car faces in the +x- direction, and it has an initial horizontal velocity of +15 m/s. It experiences an average horizontal force of +0.70 N from 1 0 to 4.5 seconds. a. What is the total horizontal impulse received by the car? A. 2.1 kg m/s B. 2.4 kg m/s C. 2.8 kg m/s D. 3.2 kg m/s E. 3.7 kg m/s b. What is the car's final speed? A. 21 m/s B. 24 m/s C. 28 m/s D. 32 m/s E. 37 m/s

Explanation / Answer

5) (A) impulse = change in momentum = m(v-u) = 0.045×58 = 2.61 kg•m/s

B) average force = impulse/time = 2.61/(5×10-3) = 522 N

C) every force has a reaction force so equal but opposite force will act on the club.

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