how much energy how much energy how much energy Whiteboard Problem #1: If I thro
ID: 1786737 • Letter: H
Question
how much energy how much energy how much energy Whiteboard Problem #1: If I throw a ball straight up into the air at as hard as I can, Will it be hard enough to get the ball on top of the roof of the physics building? How high above or below will it get? Building Height: 20 m Initial Velocity: 25 m/s Initial Height: 1.0m Ball: 150 g (baseball) Must ha motion diagram with labeled points of interest list of variables for each point of interest (kinematics and energy) position vs. time graph with equation velocity vs. time graph with equation Also answer these questions: How long does it take to get to the top? How fast is it moving past the building's roof? What impulse was delivered to ball during the throw? How much energy was transformed to thermal when it hit the ground?Explanation / Answer
the kinetic energy of ball during hitting groung is converting to thermal energy
total height acheived ball ball
v^2 = u^2 + 2aS
v = 0
u = 25
a = - 9.8
0 = (25)^2 - (2 x 9.8 x S)
S = 31.88 m
Now energy conservation
Potential energy at top = kinetic energy at ground
KE = mgh = mgS = .150 x 9.8 x 31.88
KE = 46.86 J
Now again energy conservation
thermal energy = KE
thermal energy = 46.86 J
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