A cannonball launched with a speed of 46m/s moves upwards to maximum height. Assume the speed changes steadily. Determine all unknowns.
I need initial average and final velocity but can only get average.

Alarge cruise ship of mass 7.00 ✕ 107 kg has a speed of 11.6 m/s at some instant. (a) what is the ship's kinetic energy at this time? (b) how much work is required to stop it? (give the work done on the ship. include the sign of the value in your answer.) (c) what is the magnitude of the constant force required to stop it as it undergoes a displacement of 3.00 km?