Mass and Weight

What is the mass of earth?

A ball of mass $4.5 \mathrm{kg}$ is accelerated at a rate of $10 \mathrm{m} {\mathrm{s}}^{-2}$. Calculate the force applied on the ball.

A car is moving with a velocity of $10 \mathrm{cm} {\mathrm{s}}^{-1}$ having a momentum $35 \mathrm{kg} \mathrm{m} {\mathrm{s}}^{-1}$. Calculate the mass of the car.