K.C.S.E Physics Q & A - MODEL 2003PP2QN02

K.C.S.E Physics Q & A - MODEL 2003PP2QN02

​a) A crane lifts a load of 200kg through a vertical distance of 3.0m in 6 seconds.
Determine:
(i) Work done
(ii) Power development by the crane.
(iii) Efficiency of the crane given that it is operated by an electric motor rated 12.5kW.
(b) A child of mass 20kg sits on a swing of length 4m and swings through a vertical height of 0.9m as shown in figure 2.

​Determine:
(i) Speed of the child when passing through the lowest point.
(ii) Force exerted on the child by the seat of swing when passing through the lowest point. 

ANSWERS