Question

The potential energy of a body of mass 0.8 kg increases by 400 J when it is moved
to the top of a tower from the ground. If force of gravity on 1 kg is 10 N, what is
the height of the tower? *

Answer 1

Answer:

Given that,

Mass of body M=0.8kg

Potential energy P.E=400J

Force of gravity on 1 kg is 10 N

Now,

F=mg

10=1×g

g=10m/s

2

Now, change in Potential energy

=mg(h

2

−h

1

)

=mg(h−0)

=mgh

Now, the height is

400=mgh

h=

0.8×10

800

h=80m

Hence, the height of the tower is 80 m

Explanation:

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Answer 2

The potential energy of a body of mass 0.8 kg increases by 400 J when it is movedto the top of a tower from the ground. If force of gravity on 1 kg is 10 N, what is the height of the tower? *

Given that,

Mass of body M=0.8kg

Potential energy P.E=400J

Force of gravity on 1 kg is 10 N

Now,

F=mg

10 N

Now,

F=mg

10=1×g

g=10m/s ²

Now, change in Potential energy

=mg(h² −h¹)

=mg(h−0)

=mgh

Now, the height is

100=mgh

h= 400/0.8×10

h=50m

Hence, the height of the tower is 50 m

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