Question

A ball is thrown vertically up words with velocity 30 m/s assuming no friction is present state the maximum height attained by the ball

Answer 1

Answer:

45m

Explanation:

u=30m/s

v=0m/s

a=-10m/s²

therefore, v²=u²+2as

0²=(30)²+2*-10s

-900/-20=s

s=45m

Answer 2

Answer:

Given : Time taken to reach the maximum height:

1) t = 3 s

2)   a = −g = −10m/s^2

The initial velocity of the ball can be calculated by,

Using       v = u+at

0 = u−10×3  

u = 30 m/s

Using  S = ut+1/2at^2

S = 30×3+1/2*(-10)3^2

S = 45m

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