Block B with a mass of 5 kg is riding on Cart A with a mass of 7 kg, without slipping. A horizontal force, F, is being applied to Block B so that the combined system is accelerating to the right at 2.5 m/s2. a. What is the minimum static coefficient of friction between Block B and Cart A, required to prevent slipping between the block and the cart? b. What is the magnitude of the force, F, being applied to Block B?