1. The formula for momentum is:
p = mv
p =75(18) = 1350 kg-m/s
2. We equate the momentum of the two objects
0.25 v = 0.05 (500)
v = 100 m/s
3. We use the formula for impulse:
Δmv = FΔt
55(20) = F(0.5)
F = 2200 N
The answer is Light rays are reflected by mirrors
150(x+5)-150x=x(x+5)
150x+750-150x=x^2+5x
x^2+5x-750=0
(x-25)(x+30)=0
x=25