different questions pls! Very urgent!

Question

1) the force E needed to make a machine pull,a load is partly constant and partly varies as the load to be pulled itself.when the load is 20g,the force needed is 1.4n,where as the force needed for 30g load is 2N.
Find the:
A)law connecting the load and force?
B)force for the load of 50g?
2) the distance covered by a falling ball varies as the square of the time taken.if a ball falls through 1800m in 15seconds,calculate the distance when the time taken is 15seconds and the time taken for is distance of 648m.
3)p varies directly as q^2 and inversely as rootR.when q=8 and r=9.,p=16.find p when q=5 and r=9.

Answer 1

#1 done below
#2 s = kt^2
so, s/t^2 is constant. You want

648/t^2 = 1800/15^2

#3 p = kq^2/√r
so, p√r/q^2 is constant

p√9/25 = 16√9/64

Kinda dumb to give you the same r value...