a) The empire state building is 450 meters high.A pennydropped from the top woul
ID: 1665825 • Letter: A
Question
a) The empire state building is 450 meters high.A pennydropped from the top would have what speed when it hits thesidewalk?b) A baseball player pops a flyball 20.0m straight up and thecathcer tossess his mask to catch the ball. How long will thecathcer have to wait after the ball starts back down? c) What is the initial speed of a car that required 13.7 m tostop in 4.00 s? a) The empire state building is 450 meters high.A pennydropped from the top would have what speed when it hits thesidewalk?
b) A baseball player pops a flyball 20.0m straight up and thecathcer tossess his mask to catch the ball. How long will thecathcer have to wait after the ball starts back down? c) What is the initial speed of a car that required 13.7 m tostop in 4.00 s?
Explanation / Answer
a) velocityof a freely falling body is v = 2gh v = 2*9.8*450 =93.91 m/s b) Time of flight is T= Time of accent + Time of decent = 2h/g +2h/g =19.16 s c) v = s/t = 13.7/4 = 3.245 m/s if it is moving with constant velocity
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