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Q.22. We do not get hurt, we jump with parachute. Why?

Parachute pens and expands when parachutists jump towards the

earth due to air resistance created by the earth’s atmosphere. Larger the

area of the parachute, more will be the upthrust generated by the

resistance of air. As a result, the acceleration of parachute decreases

since velocity goes on decreasing and finally the velocity turn up in

uniform velocity. Due to which the parachutists can balance their body

and do not get hurt, when jump with parachute.

Q.23. Where does the weight of a body maximum in Nepal, why?

Weight of body is maximum in Terai in Nepal because the weight of a

body is inversely proportional to the square of the distance from the

1
centre of the earth( i.e.. W∝ ). Since the distance of the terai from the centre of
2
the earth is lesser than that of mountain.