Question

3) When a ball is thrown upward its velocity decreases. We have seen that the value of
‘g’ keeps decreasing as we go higher above the surface of the earth. Thus, the force
pulling the ball downward decreases as the ball goes up. If we keep increasing the initial
velocity of the ball, it will reach larger and larger heights and above a particular value of
initial velocity, the ball is able to overcome the downward pull by earth and can move far
away from earth and will not fall back on earth.
(i) Which concept is been described in the above passage.
(ii) Which law is been used to obtain the formula/expression for above concept.
(iii) Write the formula/ expression for above concept

Answer 1

The escape velocity from the earth is about

(11 km/second. The escape velocity from a planet

having

twice the radius and the

mean density as earth.is

same