Question

A body falls from rest in the gravitational field of the earth. The distance travelled in the fifth second of its motion is $(g = 10m/s^{2})$

• A. 25m
• B. 45m
• C. 90m
• D. 125m

Answer 1

Answer: (B)

45m

Answer 2

$h_{n} = \frac{g}{2}(2n - 1) \Rightarrow h_{5th} = \frac{10}{2}(2 \times 5 - 1) = 45$m.