# An object is projected from the surface of the earth with a speed of 3.36x104 m/s. What is its speed

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by afshan123
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2015-10-29T14:20:50+05:30
Speed is 3.36x10^4 m/s = 33600 m/s = 33.6 km/s
2015-10-29T15:33:09+05:30

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V = 33,600 m/s    = velocity of projection.
for an object to escape the gravity of Earth , the speed should be 11.2 km/sec.

so the energy spent or work done in escaping the Earth's gravitational field will be:
1/2 * m * 11,200²  Joules.

Energy remaining will be:  1/2 m * 33,600²  - 1/2 * m * 11,200²  Joules
= 1/2 * m * (1003520000) J

the the velocity will be  = √1003520000  = 31, 678.4 m/sec

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