b What are (i) free fall, (ii) acceleration
due to gravity (iii) escape velocity (iv)
centripetal force ?
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Free fall
Free fall is defined as the motion of an object where gravity is the only force acting upon it.
Acceleration due to gravity
The acceleration of a body in free fall under the influence of earth's gravity expressed as the rate of increase if velocity per unit of time and assigned the standard value of 980.665 centimeters per second.
Escape velocity
The lowest velocity which a body must have in order to escape the gravitational attraction of a particular planet or other object is called escape velocity.
Centripetal force
A force that acts on a body moving in a circular path and is directed towards the centre around which the body is moving.
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