A 0.5kg object is dropped from a height of 1.25m and rebounds to a height of 0.8m. What percentage of its velocity is retained after the rebound?
Options
A
80%
B
70%
C
90%
D
85%
Answer & Analysis
Answer
A
Analysis
To determine the percentage of velocity
retained after the rebound, we first calculate the velocity just before and
just after the rebound using the equation for free fall:
Calculate the velocity just before hitting
the ground ().
Calculate the velocity just after the
rebound ().
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