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active 4: problem solving

1.what is the gravitational potential energy of an object that house on the tree that is 40 m high and the object weighs 3 kg?
2.how much work us done by a shopper in pushing her grocery cart by a force of 25N through a distance of 6 m
3a cheetah can run briefly with a speed of 31.0 m/s. suppose a cheetah with a mass of 47.0kg runs at this speed. what is the cheetah kinetic energy? ​