PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
At t=0 a hockey puck moves at 7m⋅s−1 directly east. At t=1.5s it is still moving at 7m⋅s−1 but its direction is 20∘ north of east. Which statement best describes the puck’s acceleration during this interval?
(a) The puck accelerates because its velocity direction changes while its speed remains constant.
(b) The puck does not accelerate because its speed is constant.
(c) The puck’s average acceleration is directed 20∘ north of east since that is the puck’s final direction of motion.
(d) The puck decelerates because its eastward component of velocity decreases during the turn.