1. When you throw a pebble straight up with initial speed
V, it reaches a maximum...
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Physics
1. When you throw a pebble straight up with initial speedV, it reaches a maximum height H with no airresistance. At what speed should you throw it up vertically so itwill go twice as high?
a. Insufficient information
b. 18 V
c. V sqrt(2)
d. 4 V
e. 8 V
2. A 60.0-kg man stands at one end of a 20.0-kg uniform 10.0-mlong board. How far from the man is the center of mass (or centerof gravity) of the man-board system?
a. 1.25m
b. 5m
c. 9m
d. 2.5m
Answer & Explanation
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4.5 Ratings (818 Votes)
solution 1cVsqrt2 we know at maximum height vertical speed becomes zero Vyf0 by using the motion equation final speed Vyf2Voy22gH where Voyintial vertical speed V 0V22gH HV22g
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