A 1700 kg car moving at 24 m/s collides head-on with a 2000 kg car moving at 7 m/s in the opposite direction. The cars lock together. Find their common velocity v′ just after the collision (positive in the first car’s direction).
A 1400 kg car moving at 6 m/s collides head-on with a 1900 kg car moving at 7 m/s in the opposite direction. The cars lock together. Find their common velocity v′ just after the collision (positive in the first car’s direction).
An 8 g bullet is fired horizontally into a 4 kg wooden block hanging on light strings, and stays inside it. The block swings up until it is 19 cm higher than at the start. Use g = 9.81 m/s². Find the speed v of the bullet before impact.
A 1700 kg car moving at 21 m/s runs into a stationary 1400 kg car and the two lock together. What percentage ΔK/K of the original kinetic energy is lost?
A 0.4 kg ball hits a wall at 20 m/s and bounces straight back at 20 m/s. The contact lasts 25 ms. Find the magnitude of the impulse J the wall gives the ball.
At a crossing a 1200 kg car travelling east at 16 m/s collides with a 1200 kg car travelling north at 12 m/s. The cars lock together. Find the direction θ of the wreck just after the collision, measured north of east.
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