Physics

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A box rests on the back of a truck. The coefficient of static friction between box and bed of the truck is 0.255.
(a) When the truck accelerates forward, what force accelerates the box?
A)the inertial force
B)gravity
C)centripetal force
D)the friction force

(b) Find the maximum acceleration the truck can have before the box slides.
m/s2

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