Physics
The motion of a body around a circular path is an example of

Uniform velocity, variable acceleration
Uniform speed, variable velocity
Uniform speed, variable acceleration
Uniform speed, uniform velocity

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Physics
A metal ball and a rubber ball, both having the same mass, strike a wall normally with the same velocity. The rubber ball rebounds and the metal ball does not rebound. It can be concluded that

Both suffer the same change in momentum
The initial momentum of the rubber ball is greater than that of the metal ball
The rubber ball suffers greater change in momentum
The metal ball suffers greater change in momentum

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Physics
A balloon filled with hydrogen will

Reach a particular height and start coming down
Reach a particular height and remain floating
Burst after reaching some height
Continue going upwards uninterrupted

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