Swaralee takes 20 sto carry a bag weighing 20 kg to a height of 5 m. How much power hasshe used?

Swaralee takes 40 s to carry & bag weighing 20 kg to a height of 5 m. How much power has she used?

Seema takes 1 minute to carry a bag weighing 20 kg to a height of 12 m. How much power has she used?

Calculate the work done to take an object of mass 20 kg to a height of 10 m.

Virendra bought 18 bags of rice, each bag weighing 5.250 kg. How much rice did he buy altogether? If the rice costs rs. 42 per kg, how much did he pay for it?

Solve the following examples: A man carrying a box of mass 20 kg climbs up to a height of 1m in 40s. Calculate the power delivered by him to the box.

Calculate the work done to take an object of mass 20 kg to a height of 10 m. (g = 9.8 m/s2)

Solve the following examples / numerical problems: A metal ball of mass 5 kg falls from a height of 490 m. How much time will it take to reach the ground ?

A metal ball of mass 5 kg falls from a height of 490 m. How much time will it take to reach the ground ?

A stone is thrown vertically upwards from the ground with a velocity 15 m/s. At the same instant a ball is dropped from a point directly above the stone from a height of 30 m. At what height from the ground will the stone and the ball meet and after how much time? (Use g= 10 m//s^2 for ease of calculation).