Aball is thrown horizontally from a cliff at a speed of 15 ms and strikes the ground 45 m from the base of the cliff how long was the ball in the air

3s

Explanation: initial horizontal velocity of 15m/s is independent of the acceleration due to gravity, therefore, a=0

S= it +1/2at2

45=15*t +1/2*0*t

45=15t

t=45/15

t=3s

We don't need to know about the cliff.

If the ball was thrown horizontally at 15 m/s and hit the ground 45 meters away, then it had to be sailing for (45 m) / (15 m/s) = 3 seconds in order to cover that distance.

a high pressure system is a dense air mass that is usually cooler and drier than the surrounding air. a low pressure system is a less dense air mass that is usually wetter and warmer than the surrounding air.

in general, areas that experience high atmospheric pressure also experience fair weather. low pressure systems can cause the formation of clouds and storms. air usually flows from areas of high pressure to areas of low pressure..

increase masses, decrease separation