Question

an object of mass 40kg height 5m above the ground what is the potential energy if the object is allowed to fall .find its kinetic energy when it is half way down
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Answer 1

Answer:

Kinetic energy=1000J

Explanation:

Given,

Mass=40kg

Acceleration due to gravity = 10m/s^2

Height=5m

Potential energy = m.g.h

= 40×10×5

=2000J

P.E =2000J

At a height of 5m object has a potential energy of 2000J . When this object allow to fall and it is half way down its height above the ground will be half of 5m i.e

5/2

= 2.5m

P.E at half way down =mgh

P.E= 40×10×2.5

= 1000J

P.E at half way down = 1000J

According to law of conservation of energy

Total P.E= P.E at half way down + K.E at half way down

2000=1000+ K.E at half way down

K.E at half way down = 2000-1000

=1000J

Hope it will help Uhh....

Answer 2

Answer:

Given, Mass=40kg

Acceleration due to gravity = 10m/s^2

Height=5m

Potential energy = m.g.h = 40×10×5 =2000J

P.E =2000J

At a height of 5m object has a potential energy of 2000J . When this object allow to fall and it is half way down its height above the ground will be half of 5m i.e 5/2 = 2.5m

P.E at half way down =mgh = 40×10×2.5 = 1000J

P.E at half way down = 1000J

According to law of conservation of energy

Total P.E= P.E at half way down + K.E at half way down

2000=1000+ K.E at half way down

K.E at half way down = 2000-1000 =1000J

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