A 1210 kg rollercoaster car is moving 7.33 m/s. As it
approaches the station, brakes
slow it down to 1.88 m/s over a
distance of 5.29 m. How much
work did the brakes do?

The bar of prob. 5/82 is repeated here. the ends of the 0.4-m bar remain in contact with their re- spective support surfaces. end b has a velocity of 0.5 m/s and an acceleration of 0.3 m/s2 in the di- rections shown. determine the angular accelera- tion of the bar and the acceleration of end a.

An alien spaceship is 500 m above the ground and moving at a constant velocity of 150 m/s upwards. how high above the ground is the ship after 5 seconds?

Which of the following forces require physical contact? tension air resistance friction magnetic force applied force