Question

5. [6 points] A rocket-powered hockey puck below show the z and y components of the puck's velocity. The puck starts at the origin moves on a horizontal frictionless table. The graphs Vr (m/s) (m/s) 10 10 0 t (s) 10 0 t (s) 10 -10 10 A. [4 points] What is the magnitude of the puck's acceleration? B. [2 points] Describe in words the r and y components of the puck's motion. For example: Is it moving towards or away from the origin in z, in y? Is it speeding up slowing down? Does it stop, does it turn around? or

Do Part B please.

Answer 1

For the y- component of velocity, it is speeding up as the magnitude of velocity increases with time. We can also say that the object is accelerating for y- component.

For the x- component of velocity , the body first slows down for velocity between -10m/s to 0m/s as the magnitude of velocity decreases with time or we can say it decelerates. At t=5s the body stops for an instant as v_x =0 and changes direction and speeds up from 0 to 10m/s as velocity increases with time or accelerates.