Question

Neil Armstrong and Buzz Aldrin landed on the moon in 1969. There, Neil and Buzz decided to calculate the time taken by things to reach the ground. So Neil dropped a ball from height 7.35 m from the surface of the moon and Buzz was supposed to record the time taken. How much time did it take for the ball to touch the surface?

• A. 6s
• B. 3s
• C. 9s
• D. can't calculate from the given information

Answer 1

The correct option is B

3s

As we know that gravitational acceleration at moon is 1/6^th of that of earth

Using 2^nd equation of motion

$S=\frac{1}{2}a{t}^2$

$7.35=\frac{9.8t^2}{2\times 6}$

$t=3s$