The slender 2-slug bar AB is 3 ft long. It is pinned to the cart at, A and leans against i...

The slender 2-slug bar AB is 3 ft long. It is pinned to the cart at, A and leans against it at B.

(a) If the acceleration of the cart is a = 20 fl/s2, what normal force is exerted on the bar by the cart at B?

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(b) What is the largest acceleration a for which the bar will remain in contact with the surface at B?