Question

A hockey player is traveling at a high velocity when they dig the edge of their skates into the ice to make a sudden stop. Their acceleration as they slow down is 20.5 m/s². What was their initial velocity if they came to a complete stop in 0.4 seconds?

Answer 1

Step-by-step explanation:

Given:

a = - 20.5 m/s² (Hockey player brakes)

t = 0,4 s

V = 0 m/s (Hockey player stopped)

______________

V₀ - ?

V = V₀ + a·t

Initial velocity:

V₀ = V - a·t

V₀ = 0 - (-20.5)·0.4 = 20.5·0.4 = 8.2 m/s

V₀ ≈ 30 km/h