Question

A hockey puck moving at 37m/s slams through a wall of snow 31cm thick. It emerges moving at 15m/s .

Part A
Assuming constant acceleration, find the time the puck spends in the snow.
Express your answer to two significant figures and include the appropriate units.

Part B
Assuming constant acceleration, find the thickness of a snow wall that would stop the puck entirely.
Express your answer to two significant figures and include the appropriate units.

Answer 1

V^2 = Vo^2 + 2a*d = 15^2
37^2 + 2a*0.31 = 15^2
2a*0.31 = 15^2 - 37^2
a = (15^2-37^2)/0.62 = -1845.2 m/s^2

A. V = Vo + a*t
t = (V-Vo)/a = (15-37)/-1845.2 = 0.012 s

B. V^2 = Vo^2 + 2a*d
V = 0
Vo = 37 m/s
a = -1845.2
Solve for d(thickness).