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What does the kinetic energy of a moving object depend on?

Why does increasing the speed of an object make a bigger difference to the amount of kinetic energy it has than increasing its mass.

A car with a mass of 900 kg is travelling at 5 m/s. How much kinetic energy does it have?

The car on the previous flashcard speeds up to 15 m/s. How much kinetic energy does it now have?

A man pushes a wheelbarrow with a force of 80 N for a distance of 40 m. How much work does he do?