Question

Q1 Two bodies have same momentum. Which will have greater kinetic energy- heavier

body or lighter body?

Q2. An electric bulb of 60w is used for 6h per day .Calculate the units of energy

consumed in one day by the bulb.

Q3. A boy of mass 50kg runs up to a stair case of 45 steps in 9s. If the height of a step is

15cm, find his power. (g= 10m/s2)

Q4. Two particles of masses 1g and 2g have equal momentum. Find the ratio between

their kinetic energies?

Answer 1

Q2 : energy = power x time  = 60 x 6= 360 joules

Q3: power= force x displacement= 50 x45x10x0.15