(a) Which is greater, the attraction of the earth for 1 kg of iron or the attraction of 1 kg iron for
the earth? Why?
(b) A boy throws a ball vertically upwards and catches it back in 10 s. Calculate
(i) the velocity with which it was thrown up and
(ii) maximum height attained by the ball. (Take g = 10 m/s2
)
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a. The attracting of 1 kg of Iron towards earth is greater. This is all because the Gravitational pull applied by 1 Kg of Iron on Earth is much more times smaller than that of Earth. So, earth possess a larger gravitational pull on 1 Kg of Iron
b.The time of flight is
T=2t=10 s.
The height is
h=(gt^2)/2=〖10(10/2)〗^2/2=125 m.
The initial velocity is
v=gt=10(10/2)=50 m/s.
Answer: 50 m/s; 125 m
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