A ball is throw into the sky at 18m/s. How high can it reach?

The maximum height of the ball will be "16.53 m".

Explanation:

Given that,

As we know,

The initial as well the final height on the ball will be same after it reaches it's maximum height.

then,

⇒

where,

hence,

The max height of the ball will be:

⇒

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c)as speed changes, wavelength and frequency change.

everything changes!