2. which describes the law of reflection?
the angle of reflection equals the angle of incidence.
the angle of reflection is greater than the angle of incidence.
the angle of reflection is less than the angle of incidence.

Choice 1

Law of Reflection

Theta(i)=Theta(r)

Angle of incidence=Angle of reflection

I = 7 N-s

Explanation:

Impulse is defined as

I = ∆p = m(vf - vi)

We are given

m = 0.2 kg

vi = -10 m/s (to the left)

vf = +25 m/s (to the right)

Therefore, the impulse imparted on the puck is

I = (0.2 kg)[25 m/s - (-10 m/s)]

= (0.2 kg)(35 m/s)

= 7 N-s