A contestant in a winter games event pushes a 41.0 kg block of ice across a froz

Question

A contestant in a winter games event pushes a 41.0 kg block of ice across a frozen lake with a rope over his shoulder as shown in Figure 4.29(b). The coefficient of static friction is 0.1 and the coefficient of kinetic friction is 0.03.

******THE QUESTION IS REFERING TO FIGURE B!!!! THE SECOND PICTURE**** I only have one attempt yet. ive asked this question on chegg multiple times and forumla used in figure a is not the same for figure b because i keep getting the wrong answers back

(a) Calculate the minimum force F he must exert to get the block moving.
(b) What is its acceleration once it starts to move, if that force is maintained?

Explanation / Answer

Fcos(25) - us(mg-Fsin(25) ) =0

usmg = Fcos(25)+usFsin(25)

F = usmg /(cos(25)+ussin(25))

0.1*410/(0.9063+0.0422)

F= 43.2261N

b) Fcos(25) - uk(mg-Fsin(25) ) =ma

39.176 - 0.03*(410 - 18.268) =27.42 = ma

a = 27.42/41 = 0.668 m/sec^2

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