(b) A plane is flying with a constant speed along a straight line at an angle of 30° with the horizontal.
The weight of the plane is 80, 000 N and its engine provides a thrust of 100, 000 N in the
direction of flight. Two additional forces are exerted on the plane: the lift force perpendicular to
the plane’s wings, and the force due to air resistance opposite to the direction of motion. Draw
the free-body diagram showing all forces on the plane. Determine the lift force and the force due
to air resistance.
2. A bus is moving downhill at a slope of 5° on a rainy day. At the moment when the speed of the bus is
30 km h−1,the driver spots a deer 30 m ahead. He applies the brakes and comes to a stop. The deer is
paralyzed by fear and does not move. Will the bus stop