# physics

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An object of mass 5 kg is dropped from a certain height. Just before it strikes the ground it has a kinetic energy of 1250 J. From what height was the object dropped? Ignore air resistance and use g = 10 m/s2.

• physics -

PE at start=KE at end
mgh=final KE

solve for h

• physics -

a body is thrown up with a velocity of 20 m/s . calculate the maximum height attained by the body.

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