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ICSE Class 10 Answered

find the gravitational potential energy of 1 kg mass kept at the height of 5 m above the ground. calculate its kinetic energy when it falls and hits the ground.
Asked by amit.clw4 | 11 Jun, 2021, 08:13: PM
answered-by-expert Expert Answer
Gravitational potential energy = ( m g h )
 
where m = 1 kg is mass , g = 9.8 m/s2 is acceleration due to gravity and h = 5 m is height above ground
 
Gravitational potential energy = ( 1 × 9.8 × 5 ) = 49 J
 
When the mass just before hits the ground, by conservation of energy , all its potential energy is converted to kinetic energy.
 
Kinetic energy just before hitting the ground = 49 J

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