A body can escape the gravitational pull of the earth if it is thrown up with a velocity of:

(A) 25 miles/sec
(B) 60 miles/sec
(C) 7 miles/sec
(D) 10 miles/sec

Q. Escape velocity is the speed at which the sum of an object’s kinetic energy and its gravitational potential energy is equal to:
(A) zero
(B) each other
(C) it’s speed
(D) None of these

Q. The simplest way of deriving the formula for escape velocity is to use conservation of:
(A) Electric Power
(B) Energy
(C) Speed
(D) None of these

Answers:
1. (C) 7 miles/sec
2. (A) zero
3. (B) Energy