The power required by engine of car of mass 1000 kg to accelerate it from rest to a speed of
72 km/h in 20 s is
(1) 10 kW
(2) 1 kW
(3) 100 kW
(4) 1000 kW

State one advantage and one disadvantage of using a plane mirrior as a driving mirrior

Arod of some material 0.20 m long elongates 0.20 mm on heating from 21 to 120°c. determine the value of the linear coefficient of thermal expansion [in (degrees c)^-1] for this material.

How is zig zagging a form of acceleration?