Question

A crane is lifting a body to a height 'h' in time 't'. Find the relation between the power of crane to the speed at which it is lifting the object.

Answer 1

Given:
Height=h meters
time=t sec
Formula:
Power= workdone/ Time
           =F x S /time [∵W=Fx S]
           =F x V  [∵speed= Distance/time]
∴P=F X V    

Answer 2

Given:  Height=h meters

           time=t sec

Power= workdone/ Time

          =F x S /time [∵W=Fx S]

          =F x V  [∵speed= Distance/time]

           ∴P=F X V