If the cart and the block accelerate forward fast enough, the friction force between the block and the cart would keep the block suspended above the floor without falling down. given g = 9.8 m/s 2 and the static friction coefficient µs = 0.63 between the block and the cart; the floor is horizontal and there is no friction between the cart and the floor. calculate the minimal force f on the cart that would keep the block from falling down. answer in units of n.