In the 1950s, an experimental train, which had a mass of 2.50x10^4 kg, was powered across a level track by a jet engine that produced a thrust of 5.00x10^5 n for a distance of 509m.
a. find the work done on the train
b. find the change in kinetic energy.
c. find the final kinetic energy of the train if it started from rest.
d. find the final speed of the train if there had been no fricion.

Determine the amount of work done when a crane lifts a 100-n block form 2m above the ground to 6m above the ground

An alligator swims to the left with a constant velocity of 5 \,\dfrac{\text{m}}{\text s}5 s m ? 5, space, start fraction, m, divided by, s, end fraction. when the alligator sees a bird straight ahead, the alligator speeds up with a constant acceleration of 3 \,\dfrac{\text {m}}{\text s^2}3 s 2 m ? 3, space, start fraction, m, divided by, s, start superscript, 2, end superscript, end fraction leftward until it reaches a final velocity of 35 \,\dfrac{\text {m}}{\text s}35 s m ? 35, space, start fraction, m, divided by, s, end fraction leftward. how many seconds does it take the alligator to speed up from 5 \,\dfrac{\text {m}}{\text s}5 s m ? 5, space, start fraction, m, divided by, s, end fraction to 35 \,\dfrac{\text {m}}{\text s}35 s m ? 35, space, start fraction, m, divided by, s, end fraction?

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.