Answer:
60 N
Explanation:
This is just Newton's Second Law
F = m*a
F = ?
m = 12 kg
a = 5 m/^2
F = 5*12 = 60 Newtons
n = 3.00e8/2.22e8 = 1.35
1.00sin24.5 = 1.35sinθ
θ = 17.9°
Its the sum of the potential energy and the kinetic energy