A car is moving along a straight level road with constant speed. Then
he work done on the car is infinite
the work done on the car is zero
the work done on the car is a measure of gravitational potential energy
the work done on the car cannot be found
The K.E of a body is increased most by doubling its
mass
density
speed
weight
A body is dropped from a certain height from the ground. When it is halfway down, it possesses
only K.E
only P.Ezero energy
zero energy
both K.E and P.E
A body moves through a distance of 4 m in the following different ways. In which case the maximum work is done?
When pushed over an inclined plane
When lifted vertically upward
When pushed over smooth roller
When pushed on a plane horizontal surface
A body of mass 20 kg is dropped from a height of 2m. If g is taken to be equal to 10 m/s2, the kinetic energy of body, just before striking the ground, will be
400 J
4 J
40 J
none of these
The energy required to raise a given volume of water from a well can be
mega watts
mega newton
mega joules
kilo watts
Two bodies of equal weight are kept at height h and 1.5h respectively. The ratio their P.E is
3:2
2:3
1:1
A flying aeroplane has
only potential energy
only kinetic energy
both potential and kinetic energy
Which of the following graphs best represents the graphical relation between momentum (P) and kinetic energy (K) for a body in motion?
In which of the following cases will the work done be maximum if the body is moved through a distance S on the ground?
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