1. A man of a mass 70 kg steps forward out of a boat and onto the...
Question:
1. A man of a mass 70 kg steps forward out of a boat and onto the nearby river bank with a velocity, when he leaves the boat, of 2.5 m.s relative to the ground. The boat has a mass of 400 kg and was initially at rest. With what velocity relative to the ground does the boat begin to move?
2. A railway car of mass 2 tonnes moving along a horizontal track at 2 m.s runs into a stationary train and is coupled to it. After the collision the train and car move off at a slow 0.3 m.s. What is the mass of the train alone>
3. A trolley of mass 4.0 kg and moving at 4.5 m.s collides with and sticks to a stationary trolley of mass 2.0 kg. The combined speed in m.s after the collision is?
4. A car of mass 1100 kg has a head-on collision with a large four-wheel drive vehicle of mass 2200 kg, immediately after which both cars are stationary. The four-wheel drive vehicle was travelling at 50 km h prior to the collision in an area where the speed limit was 70 km h. Was the car breaking the speed limit?