**Just need part B and part C** A box of textbooks of mass 24.6kg rests on a loa

Question

**Just need part B and part C**

A box of textbooks of mass 24.6kg rests on a loading ramp that makes an angle alpha with the horizontal. The coefficient of kinetic friction is 0.270 and the coefficient of static friction is 0.330.

a) As the angle alpha is increased, find the minimum angle at which the box starts to slip.
18.3 degrees

b) At this angle, find the acceleration once the box has begun to move. Take the free fall acceleration to be g = 9.80m/s^2.
c) At this angle, how fast will the box be moving after it has slid a distance 4.70m along the loading ramp? Take the free fall acceleration to be g = 9.80m/s^2.

Explanation / Answer

b)a=gSin-kgCos=0.565m/s2

c)v=sqrt(2as)=sqrt(2*0.565*4.7)=2.3m/s

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