Homework Help: Physical science

Posted by Ashley on Thursday, January 27, 2011 at 7:04pm.

A ball thrown upward reaches a height of 13m. How much time did it take to get to this height? How much time will take to fall to the ground?

Physical science - bobpursley, Thursday, January 27, 2011 at 7:08pm
consider energy.
InitialKineticEnergy=finalPotentialEnergy
1/2 mv^2=mg*13

V =sqrt(2*9.8*13) that is the initial velocity.
the average velocity going up is half that, so time up= 12/(1/2 sqrt(2*9.8*13)

grab your calculator.

Time down is the same as time up.

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