Power = (work done) / (time to do the work)
= (21,000 Joules) / (30 seconds)
= (21,000 / 30) joule/sec
= 700 watts
I believe it’s 1 aka A part of it is reflected as Ray 2
Momentum in x-axis before collision: 4.5 x 1.5 = 6.75
Momentum in x-axis after collision: 1.5 x 2.1 x cos(30) + 3.2 x v x cos(30)
By the principle of conservation of momentum, these are equal:
6.75 = 2.73 + 2.77v
v = 1.45 m/s
NEG: As tech gets better and better, all the old models usually just get tossed increasing all the landfill stuff that won't ever really decompose.
POS: a large reduction of paper usage, and multi functioning devices.
I believe that number 2 is A, not sure though.