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1/ An object moving at a certain speed has a kinetic energy KE of 90 J....

1/ An object moving at a certain speed has a kinetic energy KE of 90 J. If its speed is made 3 times smaller, what would the decrease in its KE be? 2/ An object of mass 1 kg is pushed up along a 5 m long incline to a vertical height of 1 m. The change in its potential energy is;
3/ A 1-kg object is dropped from a height of 40 m and falls freely to the ground. When the object is halfway down, its kinetic energy is; (g=10m/s2)
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