Two balls, one twice as massive as the other, are dropped from the roof of a building (freefall). Just before hitting the ground
, the more massive ball has ______ the kinetic energy of the less massive ball. (Neglect air friction.)
1 answer:
KE= 1/2 mv^2
Kinetic Energy is equal to 1/2 x mass x velocity squared
The mass of the larger ball has TWICE
the kinetic energy. KE is directly proportional to the mass.
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- initial velocity=u=0m/s
- Final velocity=v=4m/s
- Time=t=2.5s
Acceleration = (Vf - Vi)/t
Since Vf= 60m/s
Vi= 15m/s
T= 15s
=> a= (60m/s - 15m/s)/15s
= 3
So the acceleration is 3m/s^2
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