A pick-up truck is traveling with a speed of 60 mph west. At the moment the pick
ID: 1838792 • Letter: A
Question
A pick-up truck is traveling with a speed of 60 mph west. At the moment the pick-up truck passes in front of you (while you're standing on the street), a person on the back of the truck throws a baseball with a speed of 40 mph east. If air resistance is ignored, from the driver's perspective, what is the velocity of the ball? A. 60 mph west B. 100 mph east C. 20 mph east D. 40 mph west E. none of the above
Which of the following would be categorized under Dynamics?
the compression of the meniscus in the knee
the result of the compression of the meniscus on the knee
ground reaction forces when standing
force production in a concentric contraction
grip strength measured on a hand grip dynanometer
A.the compression of the meniscus in the knee
B.the result of the compression of the meniscus on the knee
C.ground reaction forces when standing
D.force production in a concentric contraction
E.grip strength measured on a hand grip dynanometer
Explanation / Answer
observer is on the gorund hence velocity of ball wrt gorund , Vb = 40 mph
(east as +ve and west as -ve).
velocity of truck, Vt = 60 mph west = -60 mph
Velocity of ball wrt truck, Vbt = Vb - Vt = 40 - (-60)
= 40 + 60 = 100 mph
hence 100 mph east.
Ans(B)
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