Physics

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A 2.42kg block starts from rest at the top of a 22.9◦ incline and accelerates uniformly down the incline,moving 2.41m in 2.14s. The acceleration of gravity is 9.81m/s2. a) What is the magnitude of the acceleration of the block?
b) What is the coeﬃcient of kinetic friction
between the blockand the incline?
c) What is the magnitude of the frictional
force acting onthe block?
d)What is the speed of the block after it slides
the distance of 2.41?

• Physics -

a. you know the final speed (twice average). Vf=2*2.41m/2.14s

b. do energy concepts
KEfinal=KE initial + PEinitial-PEfinal-Frictionenergy
or
1/2 m vf^2=0 + mg 2.41/sinTheta -0-friction energy

solve for friction energy
then, Frictionenergy=mu(mg*cosTheta)
solve for mu.

c. friction energy=force*distance solve for force.

d. See a.

• Physics -

Can you tell me the answer for c and d. I got the one for a and b correct but c says it's not correct. I put 21.96N.

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