Is my answer correct. Why is the angle 180 for the sliding? A 77-kg base runner

Question

Is my answer correct. Why is the angle 180 for the sliding?

A 77-kg base runner begins his slide into second base when he is moving at a speed of 5.0 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base (b) How far does he slide? (a) How much mechanical energy is lost due to friction acting on the runner? w = (F cos )2 x (change of speed in this problem) The angle will be 180 cos of 180 is negative 1, which will give us -F Why is angle 180 2 The force is the friction use coefficient for friction Baseball is running at a speed of 5.0 m/s. When he slides into second base, he stops, and not moving, velocity is zero 2 KE = 1 mo,2-1 (77 kg) (5.0 m/s)2 KE = 0-1 (77 kg) (25 m/s) KE =-1 (1925) -962.50 = (-0.70) (77) (9.80) x -962.50 = (-528.22 )/lx -962.50 (-528.22) x 528.22 -528.22 KE -962.50 J 1.8 m

Explanation / Answer

In the part (a), the workdone W= change in K.E= -962.5 J

ans is correct

In the part(b), as the runner is sliding , the frictinal force acting opposite to the motion of the runner( sliding)

so the angle between frictional force and displacement is 1800.

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