A skater with an initial speed of 7.30 m/s stops propelling himself and begins to coast across the ice, eventually coming to rest. Air resistance is negligible. (a) The coefficient of kinetic friction between the ice and the skate blades is 0.105. Find the deceleration caused by kinetic friction. (b) How far will the skater travel before coming to rest?

Question

Physics

Glenn Sparks

4 October, 14:29

A skater with an initial speed of 7.30 m/s stops propelling himself and begins to coast across the ice, eventually coming to rest. Air resistance is negligible. (a) The coefficient of kinetic friction between the ice and the skate blades is 0.105. Find the deceleration caused by kinetic friction. (b) How far will the skater travel before coming to rest?

+2

Answers (1)

Know the Answer?

Caroline Knapp · Answer 1

a. a = 1.029 ms⁻²

b. S=25.89 m

Explanation:

given

initial speed is u = 7.30 m/sec

final speed is v = 0 m/sec

mu_k = 0.105

kinetic frictional force is Fk = mu_k*m*g

mu_k*m*g = m*a

m cancels

mu_k*g = a

deccelaration a = mu_k*g = 0.105*9.8 = 1.029 ms⁻²

b) using v²-u² = 2aS

0²-7.3² = - 2*1.029*S

53.29=2.058*S

S = 53.29/2.058

S=25.89 m