1. A 500 kg car moving with a velocity of 10 m/s on a straight road, doubles its velocity in 1 minute. What is the power

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1. A 500 kg car moving with a velocity of 10 m/s on a straight
road, doubles its velocity in 1 minute. What is the power delivered
by the engine for doubling the velocity?
1A. A man, of mass m, standing at the bottom of the
staircase, of height L climbs it and stands at its top. What is the
work done by the man?
1B. Which of the following groups are all renewable energy
sources? Why/How?
(a). the tides, water waves, and nuclear fuel / (b). biofuel,
geothermal, and coal / (c). geothermal, the tides, and
hydro-electricity
1C. Suppose the gravitational force between two massive spheres
is 100 N. If the distance between the spheres if doubled, what is
the force between the masses? Explain.
(a). 400 N / (b). 200 N / (c). 100 N / (d). 50 N / (e). 25
N