Aknight sits on a castle wall during a siege. to while away the time, he notes that boulders catapulted from below land on the top of his wall with a vertical velocity of 5.6 m/s. if he is 39 m above the catapult, what is the initial velocity of the boulders? the acceleration of gravity is 9.8 m/s 2 . answer in units of m/s.

v = 28.21 m/s

Explanation:

given,

vertical velocity of the boulder = 5.6 m/s

height of catapult = 39 m

initial velocity = ?

acceleration due to gravity = 9.8 m/s²

maximum height attained

v² = u² + 2 as

5.6² =  = 2 g h

h = 1.6 m

total height above catapulted

H = 39 + 1.6 = 40.6 m

v = 28.21 m/s

so the intial velocity is equal to v = 28.21 m/s

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:

co2reflects heat radiation back to earth buning coal and oil emits co2 globe warms