The front 1. 20 m of a 1, 550-kg car is designed as a \"crumple zone\" that coll

Question

The front 1. 20 m of a 1, 550-kg car is designed as a "crumple zone" that collapses to absorb the shock of a collision. If a car travelling 21. 0 m/s stops uniformly in 1. 20 m, how long does the collision last? What is the magnitude of the average force on the car? What is the magnitude of the acceleration of the car? Express the acceleration as a multiple of the acceleration of gravity. A 9. 5-g bullet is fired into a stationary block of wood having mass m = 4. 96 kg. The bullet imbeds into the block. The speed of the bullet-plus-wood combination immediately after the collision is 0. 597 m/s. What was the original speed of the bullet? (Express your answer with four significant figures. )A car of mass m moving at a speed collides and couples with the back of a truck of mass 3m moving initially in the same direction as the car at a lower speed V2- (Use any variable or symbol stated above as necessary. )What is the speed Vf of the two vehicles immediately after the collision? What is the change in kinetic energy of the car-truck system in the collision? A K =

Explanation / Answer

1) 21*21 = 2*a*1.2

a= - 183.75 m/s^2

avg opposing force = - 284812.85 N ( sign indicates opposite direction )

a mag = 183.75 m/s^2

2)

9.5*V + 4960*0 = (9.5+4960)*0.597

v = 312.29 m/s

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