A single constant 10-pound force F1 acts on a body, causing it to accelerate. Then, while F1 continues to act, a second constant force F2 is applied to the body, which comes to a momentary stop. The magnitude of F2 is
A. exactly 10 pounds.
B. larger than 10 pounds.
C. a bit less than 10 pounds.
D. zero.
E. There is not enough information to tell
Answer: B
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An 80-g particle moving with an initial speed of 50 m/s in the positive x direction strikes and sticks to a 60-g particle moving 50 m/s in the positive y direction. How much kinetic energy is lost in this collision?
a. 96 J b. 89 J c. 175 J d. 86 J e. 110 J
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