(6) Spheres A and B of uniform density have
masses 1 kg and 100 kg respectively. Their
centres are separated by 100 m (1) Find the
gravitational force between them. (1) Find the
gravitational force on A due to the earth.
(iii) Suppose A and B are initially at rest and A
can move freely towards B. What will be the
velocity of A one second after it starts moving
towards B? How will this velocity change with
time? How much time will A take to move
towards B by 1 cm? (iv) If A begins to fall,
starting from rest, due to the earth's downward
pull, what will be its velocity after one second ?
How much time will it take to fall through 1 cm?
[Mearth) 6 102 kg, Rearth) - 6400 km]
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