Find the work done in moving and object along vector r=3i +2j-5k if applied force is f=2i-j-k​

Aboxcar traveling at 12 m/s approaches a string of 5 identical boxcars sitting stationary on the track. the moving boxcar collides and links with the stationary cars and they all move off together along the track. what is the final speed of the cars immediately after the collision? (you may take the mass of each boxcar to be 18,537 kg.)

Vi. on another planet, a spring with constant 4.7 n/m is set up and allowed to expand verticaly freely. 8.4kg mass is placed on the spring and the spring extends 5.28m. calculate the exected extension on earth.

The place where two plates come together is known as a a. transform boundary. b. divergent boundary. c. convergent boundary. d. rift valley.