Question:
What is the value of escape velocity for an object on the surface of Earth ?
A10.2 km/s
B10.2 m/s
C11.2 m/s
D11.2 km/s
Answer:
D. 11.2 km/s
Explanation:
Escape velocity:
Escape velocity is the minimum speed needed for an object to escape from the gravitational influence of earth.
Escape speed is achieved when the object moves with a velocity at which the arithmetic sum of the object's gravitational potential energy and its Kinetic energy equates to zero.
That is, the object should possess greater kinetic energy than the gravitational potential energy, in order to escape to infinity.
v Escape = √(2GM/r)
Note:
Escape velocity on the earth is 11.2 km/s.
Escape velocity on the moon is 2.37 km/s.