Superman is flying 54.5 m/s when he sees a train about to fall into a river 850 m away. he must reach the train in 4.22 s. what acceleration does he need? (unit = m/s^2)

Answer: it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.explanation:   we have equation of motion ,where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.average velocity = displacement/ time taken.average velocity = 10.69 miles/hr = 10.69*1.6*1000/(60*60) = 4.75 m/s4.75 = s/ts = 4. 1we also have acceleration = 2.18 m/s², initial velocity = 0 m/sso it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.

The objects are acted upon by only one force. gravity. mass times the acceleration of gravity (-9.81meters/second squared).

Because its reliable.   there is no pollution  the chances of a radiation leak is low

This is kenetic energy.