Question

A ball is projected vertically upwards it's speed at half hight is30 m/s maximum hight attainded by the ball

Answer 1

Answer:

90m or 91.8 m

Explanation:

Using equations of motion, where symbols have their usual meaning:

=> v² = u² + 2aS,

While going upward, at half of maximum height:

=> (30)² = u² + 2(-g)(S/2)

=> 900 = u² - gS ...(1)

At the maximum height, where speed = 0.

=> 0² = u² + 2(-g)S

=> u² = 2gS ... (2)

Substitute the value in (1) from(2):

=> 900 = 2gS - gS

=> 900 = gS

=> 900 = 9.8S {g = 9.8}

=> 91.8m = S

Whem g = 10, S = 900/10 = 90 m