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Relative Velocity

A ball is thr...

Question

A ball is thrown upwards from the ground with an initial speed of u. The ball is at a height of 80m at two times. The time interval being 6 seconds. Find u . g=10m/s²

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Solution

The initial speed = u.
The height = 80m
Time interval = 6 seconds
$T i m e o f a s c e n d, t 1 0 = u - g t_{1} T i m e o f d e s c e n d, t_{2} u = g t_{2} S o, t_{1} + t_{2} = 6 2 u / g = 6 u = 3 g = 29.4 m / s$

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