JAMB - Physics (2000 - No. 5)
If the force and the velocity on a system are each reduced simultaneously by half, the power of the system is
doubled
reduced to a quarter
reduced by half
constant
解释
The Relation between Power, Force and Velocity is given by the relation:
P = F.V , this power is the product of force and velocity.
Therefore, The power of the system is reduced to one-quarter of its original value when both the force and the velocity are reduced by half.