Physics
The potential difference between the terminals of an electric heater is 60 V when it draws a current of 4 A from the source. What current will the heater draw if the potential difference is increased to 127.5 V ?

0.41666666666667
8.5 A
24 A

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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

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

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