A train travelled from city A to city B . for the first 14 hours it travelled at an average speed of 120 km/h . for the next 10 hours it travelled at an average speed of 90 km/h was the average speed of the whole journey km/h ?

Astone weighing 1.5 kilograms is resting on a rock at a height of 20 meters above the ground. the stone rolls down 10 meters and comes to rest on a patch of moss. the gravitational potential energy of the stone on the moss is joules.

Under normal conditions, describe how increasing the temperatures effects the solubility of a typical salt

The friction of the water on a boat produces an acceleration of -10. m/s2. if the boat is traveling at 30. m/s and the motor is shut off, how long it take the boat to slow down to 5.0 m/s?