A woman pushes her new John Deere walk behind mower to the right as she approaches her garage. If she pushes the 55-kg mower with a force of 120 N directed downward at an angle of 40 degrees, what is the acceleration if there is a frictional force of 42 N resisting its motion? What is the normal force acting on the mower?

Ahot-air balloon takes off from the ground traveling vertically with a constant upward acceleration of magnitude g/4. after time interval δt, a crew member releases a ballast sandbag from the basket attached to the balloon. how many seconds does it take the sandbag to reach the ground? (express your answer in terms of δt)