First slide

Rectilinear Motion

Question

A body dropped from the top of a tower covers a distance 7x in the last second of its journey, where x is the distance covered in the first second. How much time does it take to reach the ground?

Moderate

A

3s
B

4s
C

5s
D

6s

Solution

$\begin{array}{l} Given 7 x = \frac{g}{2} (2 n - 1) and x = \frac{1}{2} g (1)^{2} \\ Solving these two equations, we get n = 4 s . \end{array}$

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