ExpertTA HW replacement: Assignment-5 A hockey puck has a velocity of v-vi+ vj.

Question

ExpertTA HW replacement: Assignment-5 A hockey puck has a velocity of v-vi+ vj. Another puck with identical mass is at rest at the origin. The two pucks collide. After the collision it is observed that the second puck has a velocity of v-vaj. Write an expression for the first puck's velocity after the collision, in terms of the variables in the problem statement and the unit vectors i and j. What is the magnitude of the first puck's velocity, in meters per second, after the collision? At what angle does this velocity make with respect to the x-axis, in degrees? a. b. C. Otheexpertta.c

Explanation / Answer

Using momentum conservation

Pi = mVx i^ +mVy j^

P2f = mV2y j^

Pi = Pf

mV1f = mVx i^ +mVy j^ - mV2y j^

V1f = Vx i^ + (Vy - V2y) j^ (ans)

b) Magnitude = sqrt [Vx^2 + (Vy - V2y)^2] (ans)

c) Angle = arctan [(Vy - V2y)/Vx] CCW from positive X axis(ans)

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