Question

a body projected upward is it same height from ground at t=equal to 1 seconds and t=9 second .find the maximum height attained by it. [g= 10 m/s]​

Answer 1

Answer:

Max height attained = 45 m

Explanation:

A body projected upward is it same height from ground at t=equal to 1 seconds and t=9 second .find the maximum height attained by it. [g= 10 m/s]​

S = ut + (1/2)at²

a = -g  = -10

S₁ = u*1 + (1/2)(-10)*1²  = u - 5

S₉ =  u*9 + (1/2)(-10)*9²  = 9u - 405

u - 5 = 9u - 405

=> 8u = 400

=> u = 50

Speed at max height = 0

V² - u² = 2as

=> 0² - 50² = 2(-10)h

=> h = 125

Max height attained = 45 m