momentum = mass * velocity
p = mv
p = 1.5 kg * 40 ms^-1
p = 60 kgm/s
To find components of a vector:
px = p * cos(theta)
px = 60 * cos(30)
px = 51.96 = 52 (rounded to two significant digits)
py = p * sin(theta)
py = 60 * sin(30)
py = 30
He initial momentum is 60kgm/s
The horizontal component is 52 kgm/s
The vertical component is 30 kgm/s