pls give explanations too
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1.According to kepler's law of planetary motions
we know that T^2 is directly proportional to r^3(semi major axis)
now square on both sides
T proportional to r^3/2
so option (3)
2.
m=200g = 0.2kg (in physics we use kg so convert it)
v=12m/s constant speed
observe the word constant speed which is same as uniform .
so when velocity is constant .Its obvious acceleration is 0 and hence force is zero
So option (4) is correct.
3.
so let distance between 3m and 16m be d
and distance between 3m and m be x and
distance between m and 16m be (d-x)
so lets equate force between (3m and m) and (m and 16m)
so its 3d/7 from 3m
Hence option (2) is correct!
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