[" 3.An object of mass "2kg" is lifted "],[" vertically through a distance of "],[1.5m" .The work done in process is "],[[" (a) "29.4J" (b) "19.4J" (c) "17.4J" (d) "20.4J]]

A body of mass 1 kg is lifted through a height of 1m, then its work done is

An object of 100 kg is lifted to a height of 10 m vertically. What will be the work done ? [g = 9.8 m//s^(2)]

What power is needed to lift a 49-kg person a vertical distance of 5.0 m in 20.0 s ?

An object of mass 10 kg falls from rest through a vertical distance of 10 m and acquires a velocity of 10 ms^(-1) . The work done by the push of air on the object is (g = 10 ms^(-2) )

A chain consisting of 5 links each of mass 0.1 kg is lifted vertically with a constant acceleration of 2.5 m//s^(2) as shown in the figure. The force of interaction between the top link and the link immediately below it, will be

In a factory it is desired to lift 746 kg of metal through a distance of 60 m is 1 min. The minimum horsepower of the engine to be used will be

[" A block of mass "2kg" is kept inside a "],[" lift.Lift starts moving downward with "],[" an acceleration of "a=12m/s^(2)" ."],[" Height of the lift is "4m" .Time after "],[" which block will strike roof of the lift "i" ."]