3.A 100-kg Barrel Tank rests on the bed of a truck. The coefficients of friction between the surfaces are μk = 0.123 and μs = 0.39

3.A 100-kg Barrel Tank rests on the bed of a truck. The coefficients of friction between the surfaces are μk = 0.123 and μs = 0.39. Find the frictional force on the crate when the truck is accelerating forward relative to the ground at (a) 5.00 m/s2, and (b) 6.90 m/s2