A 50g marble is moving at 2m/s when it strikes a 20g marble at rest. Immediately
ID: 1340063 • Letter: A
Question
A 50g marble is moving at 2m/s when it strikes a 20g marble at rest. Immediately after the collision, the 50g ball is moving at 1m/s. Is this an elastic collision? Why not? (which one the correct answer?
No, because momentum is not conserved.
No, because potential energy is not conserved.
No, because total mechanical energy is not conserved.
No, because kinetic energy is not conserved.
a.No, because momentum is not conserved.
b.No, because potential energy is not conserved.
c.No, because total mechanical energy is not conserved.
d.No, because kinetic energy is not conserved.
Explanation / Answer
answer is d) Kinetic energy changed
momentum will remain conserved as no external force is applied .
so final velocity of 20g marble would be 2.5 m/s
clearly KE final = 87.5 units
initially 100 units
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