The $CGS$ unit of work is:

Which would have a greater effect on the kinetic energy of an object: doubling the mass,or doubling the velocity?

State the type of energy transformation in the following cases: $(a)$ in a loudspeaker $(b)$ solar battery.

$A$ girl is carrying a school bag of $3 \, kg$ mass on her back and moves $200 \, m$ on a levelled road. The work done against the gravitational force will be $(g = 10 \, m \, s^{-2})$.

State whether the following statement is true or false:
When an arrow is released from a bow,potential energy changes into kinetic energy.

$A$ boy pushes the wall in the class for five minutes but the wall does not move. Another boy pushes the chair from the front to the back side of the class. In which case,more work is done?