Question

A feather is dropped on the moon from a height of 13.36 m. The acceleration due to gravity on the moon is $1.67\frac{m}{s^2}$​. Determine the time taken by the feather to fall on the surface of the moon?

• A. 3 s
• B. 2 s
• C. 4 s
• D. 5 s

Answer 1

The correct option is C

4 s

Using second equation of motion,
$s=ut+\frac{1}{2}a{t}^2$

$13.36=0+\frac{1}{2}\times 1.67\times t^2$

$t=\sqrt{\frac{26.72}{1.67}}$ s

t = 4 s