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Q.
A ball thrown vertically upward with a speed of $19.6\, m / s$ from the top of a tower returns to the earth in $6$ second. What is the height of the tower?
Motion in a Straight Line
Solution:
$u =-19.6\, ms ^{-1} a =9.8\, ms ^{-2} t =6 s$
$S = ut +\frac{1}{2} at ^{2}$
$S =-19.6 \times 6+\frac{1}{2} \times 9.8 \times 6^{2}$
$=-19.6 \times 6+4.9 \times 36$
$S =58.8\, m$