Question

A student rolls a coin off of a high horizontal platform, in a projectile experiment. The coin moves $20$ centimeters horizontally (while also falling down) during the $1st$ second of its projectile motion.
How far will the coin move horizontally during the $2nd$ second of its projectile motion?

• A. $10centimeters$
• B. $20centimeters$
• C. $40centimeters$
• D. $80centimeters$

Answer 1

Answer: (B)

$20centimeters$

The only force acting on the coin is $g$ downwards, none in horizontal direction.

Hence the speed of coin in horizontal direction remains unchanged.
Thus the coin moves 20cm every 1 second.

Hence correct answer is option B.