1) a 6 kg cart on a level surface is pulled at a constant velocity of 2 m/sec by a constant force of 10 N . what is the acceleration? what is the friction force opposing the motion ?
2) A hot air balloon (with bucket) has a mass of 900 kg . the balloon has a buoyant force upward of 12,000 N and a westward wind force of 500 N . Find the acceleration of the balloon . What is the force of gravity (weight) of the balloon and bucket ?