How much work is done by a crane lifting a 200 kg crate from the ground to a floor 21 m above the ground. What is the change in gravitational potential energy of the crate?
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workdone=mgh =200*21*10 (g=10m/sec^2)
=42000j
potential energy of crate in the ground is zero due to height is zero but on the floor Potential energy is -42000j
=42000j
potential energy of crate in the ground is zero due to height is zero but on the floor Potential energy is -42000j
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