To study the performance of a race car, a high-speed camera is positioned at point a. the camera is mounted on a mechanism which permits it to record the motion of the car as the car travels on straightaway bc. it took 0.5 s for the car to travel from the position θ = 60° to the position θ = 35°. knowing that b = 25 m, determine the average speed of the car during the 0.5-s interval.

Diego is trying to lift a piano to the second floor of his house. diego uses a pulley system and gives a big lift to the piano.the piano moves upward, then stops, and then it starts to fall to the ground. which list best describes the forces on the piano in the proper order? positive force → balanced force → negative force negative force → balanced force → positive force positive force → unbalanced force → negative force negative force → unbalanced force → positive force