Here we will use conservation of energy to tackle a simple free-fall problem. Yo
ID: 1427875 • Letter: H
Question
Here we will use conservation of energy to tackle a simple free-fall problem. You throw a 0.150 kgbaseball straight up in the air, giving it an initial upward velocity of magnitude 20.0 m/s. Use conservation of energy to find how high it goes, ignoring air resistance.
You throw the same baseball up from the surface of Venus (where the acceleration due to gravity is 8.87m/s2) with the same speed as before. Find how high the ball goes.
Express the height in meters to three significant figures.
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Explanation / Answer
a)
use conservation of energy
kinetic energy at bottom = potantial energy at top
0.5*m*v^2 = m*g*h
0.5*v^2 = g*h
0.5*20^2 = 9.8*h
h = 20.4 m
Answer: 20.4 m
b)
use conservation of energy
kinetic energy at bottom = potantial energy at top
0.5*m*v^2 = m*g*h
0.5*v^2 = g*h
0.5*20^2 = 8.87*h
h = 22.5 m
Answer: 22.5 m