A stone is thrown vertically up from the ground with a velocity of 90 m/sec. How long must one wait before dropping a second stone from the top of a tower 180 m. high if the two stones are to pass each other 60 m. from the top of the tower?

weather forecasts are done by collecting data about the current state of the atmosphere mainly the temperature, humidity and wind and using meteorology, to determine the atmosphere that evolves over time. the h and l mean the high and low pressure. the red strip is a warm front. the blue strip is a cold front. the blue and red strip is a stationary front. the purple strip is a occluded front.

explanation:

he made 11 calls in one day