posted by kingstone on .
(1)A battery drives 60c of charge in a circuit for 20s. Thecurrent in the circuit is?(2)What is the volume of a block of expanded polystyrene of 400g and density 16kg/m3?(3)The velocity of a toy car of mass 2kg increased from 5m/s to 10m/s in 2seconds.What force was exerted on the car?(4)A stone of mass 2kg is dropped from a height of 3metres neglection air resistance the kinetic energy in joules of the stone just befor it hits the ground is?(5)An object initially travelling at a velocity of 10m/s changes its velocity to 30m/s in 40seconds calculate the acceleration?