A50-mg boxcar a is moving in a railroad switchyard with a velocity of 10 km/h toward cars b and c, which are both at rest with their brakes off at a short distance from each other. car b is a 25-mg flatcar supporting a 40-mg container, and car c is a 45-mg boxcar. as the cars hit each other, they get automatically and tightly coupled. determine the velocity of car a immediately after each of the two couplings, assuming that the container does not slide on the flatcar.

What do elements in a family tend to share. a.) similar periods b.) similar groups c.) similar atomic symbols d.) similar chemical properties and characteristics

Why do different substances have diffrent properties

Visualize the problem and identify special cases first examine the problem by drawing a picture and visualizing the motion. apply newton's 2nd law, ∑f⃗ =ma⃗ , to each body in your mind. don't worry about which quantities are given. think about the forces on each body: how are these consistent with the direction of the acceleration for that body? can you think of any special cases that you can solve quickly now and use to test your understanding later? one special case in this problem is if m2=0, in which case block 1 would simply fall freely under the acceleration of gravity: a⃗ 1=−gj^.