Homework Help: Physics

Posted by lola on Sunday, January 29, 2012 at 3:27pm.

A 20.0kg curling stone at the hog line and moves 28.35m [west] to sit on the button and score a point. If the coefficient of kinetic friction between the stone and the ice is 0.00200, what was the initial speed of the stone when it was released?

Physics - Damon, Sunday, January 29, 2012 at 3:44pm
F = - 20 * 9.8 * .002
F = m a
-20 * 9.8 * .002 = 20 a
a = -19.6 *10^-3 m/s^2

stops at time t at the button
v = Vi + a t
0 = Vi + a t
t = -Vi/a

d = Vi t + (1/2) a t^2
28.35 = Vi (-Vi/a) + (a/2) Vi^2/a^2
28.35 = -Vi^2/a + (1/2) Vi^2/a
28.35 = -(1/2) Vi^2/a
so
Vi^2 = -2 (28.35)(-19.6*10^-3)
Vi^2 = 1111
Vi = 33.3 m/s

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