Project

Question 1:

Mass of the object, m=1.2kg

Acceleration due to gravity, g=9.8 `m/s^2`

`Height, h=80`

Potential Energy, P.E = mgh

P.E = `1.2*9.8*90`

P.E = 1058.4 J

By Law of conservation of energy, At Height,v,

(P.E+K.E) at Position X = (P.E+K.E) at Position Y.

We also know that at Position Y, K.E = 3 x P.E

`1058.4 = (1.2*9.8*v)+3(0.8*9.8*v)`

`1058.4 = (1.2*9.8)(v+3v)`

`4v=90`

`v=22.5`

Question 3:

Total Resistance = `(30*60)/(30+60)`

Total Resistance = 20 ohm