Question

A hockey puck sliding on a frozen lake comes to rest after traveling 160 m.
If its initial velocity is 2.3 m/s, what is its acceleration (assumed constant)?
Answer in units of m/s2.

Answer 1

The distance = (1/2)*(acceleration)*(time)^2 + (initial velocity)*(time)

substitute:
acceleration= (final velocity-initial velocity)/time

The distance = (1/2)*[(final velocity-initial velocity)/time]*(time)^2 + (initial velocity)*(time)

Find time & plug back into acceleration formula!