30 ! need ! a charge of 8.5 × 10–6 c is in an electric field that has a strength of 3.2 × 105 n/c. what is the electric force acting on the charge? a. 0.27 n b. 2.7 n c. 27 n d. 270 n

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.)

Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?

The amount of potential energy possessed by an elevated object is equal to what?