The parking brake on a Cadillac has failed, and it is rolling slowly, at , toward a group of small children. Seeing the situation, you realize you have just enough time to drive your Volkswagen head-on into the Cadillac and save the children. With what speed should you impact the Cadillac to bring it to a halt?
The speed will be
We have given,
speed of Cadillac =
Mass of Cadillac=
Mass of Volkswagen =
We have to find the speed of Volkswagen.
According to conservation of momentum, the initial momentum of the system will be same after the Collison.
A 2100 kg truck is traveling east through an intersection at 2.0 m/s when it is hit simultaneously from the side and the rear. (Some people have all the luck!) One car is a 1200 kg compact traveling north at 5.0 m/s. The other is a 1500 kg midsize traveling east at 10 m/s. The three vehicles become entangled and slide as one body. What are their speed and direction just after the collision?
Old naval ships fired 10 kg cannon balls from a 200 kg cannon. It was very important to stop the recoil of the cannon, since otherwise the heavy cannon would go careening across the deck of the ship. In one design, a large spring with spring constant 20,000 N/m was placed behind the cannon. The other end of the spring braced against a post that was firmly anchored to the ship’s frame. What was the speed of the cannon ball if the spring compressed 50 cm when the cannon was fired?
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