Answers

2015-05-30T21:51:00+05:30
Use the potential energy formula, PE=m*g*h.
you will get mass from there then substitute in the kinetic energy formula, KE=1/2*m*v*v.
you have the mass now you can find the velocity.
 

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2015-05-31T06:41:35+05:30
You can use the potential energy formula, PE=m*g*h.
you will get mass from there then substitute by using the kinetic energy formula, KE=1/2*m*v*v.
at last you have the mass now you can find the velocity.
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