I actually know the answer to this one, you use pennies to find the atomic weight of a penny, it really doesn't have a weight. LOL
A falling raindrop
Kinetic energy and potential energy are both applied when a body or object is falling.
F=ma
a=F/m=300/25=12 m/s^2
Velocity, va2 = 10.5 ft/s
<u>Explanation:</u>
From the figure:
Length of the cable = Sa + 2Sb = l
∴ vₐ = -2vb
Applying the principle of Impulse and momentum in x-direction

Limit is t1 to t2
-(1)
Applying the principle of Impulse and momentum in y-direction

Limit is t1 to t2
-(2)
Solving equation (1) and (2), we obtain
T = 1.6lb
va2 = 10.5 ft/s