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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 Solved by verified expert
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    See Answer
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