A 1200 kg car decelerates uniformly from v=25 m/s, to rest over a distance of s=50 m. Draw the free-body diagram. • Find the deceleration and the net force using d'Alembert's principle.
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- a winch lifts a bag of sand of mass 12kg from the ground with a constant force of 240N until it reaches a speed of 10m/s. Then the winch provides a force to keep the bag moving at constant speed. Find the time taken to reach the height of 40m.Write Newton’s Second Law of Motion for three-dimensionalmotion with only the gravitational force (acting in the z-direction).A firework of mass 0.4 kg is fired vertically upwards with initial speed 40 m/s. The firework itself provides a force of 2 N upwards. The firework explodes after 6s. Find the height at which it explodes.
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- A stream of water flowing horizontally with a speed of 15ms- gushes out of a tube of cross-sectional area 10-2m? , and hits a vertical wall nearby. What is the force exerted on the wall by the impact of water, assuming it does not rebound?An object is shot straight upward from sea level with an initial velocity of 400 ft/sec. a. Assuming that gravity is the only force acting on the object, give an upper estimate for its velocity after 5 sec have elapsed. Use g = 32 ft/sec2 for the gravitational acceleration. b. Find a lower estimate for the height attained after 5 sec.