Question

50) How much energy should be supplied to a body of mass 500 kg, so that it can escape from the
gravitational pull of the earth? (g = 10 m/s2 and R = 6400 km ]
ONLY CORRECT ANSWER PLEASE​

Answer 1

Explanation:

Answer

Energy balance

KE

i

+PE

i

=KE

f

+PE

f

⇒

2

1

mv

2

−

R

GMm

=0−0

⇒

2

1

mv

2

=

R

GMm

v=

R

2GM

=

2gR

v=11.2km/c

Energygiven=

2

1

mv

2

=

2

1

×100×(11.2×10

3

)

2

⇒6.3×10

9

J

Hence,

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Answer 2

6. 4×108J

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