Question

When a ball moves from and reaches to its maximum height in 3 seconds , what is its initial velocity? A. 40m/sec B. 35m/sec C. 29.4m/sec D. 25m/sec

Answer 1

Hi friend

Use first equation of motion

$v-u=-gt\\0-u=-gt\\\\u=9.8*3\\u=29.4m/s$

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Answer 2

Answer:

As the body reaches maximum height its final velocity will be zero, applying Newton's first law

v = u + gt

-u = -gt ( g will be negative as it moves up )

u = 9.8×3

u = 29.4 m/sec

Hence initial velocity of ball will be 29.4 m/s