David will be unsuccessful. The average human reaction time is about 0.2 s (research on the Internet) and a dollar bill is about 15.5 cm long, so David’s fingers are about 8 cm from the end of the bill before it is dropped. The
bill will fall about 20 cm before he can close his fingers
Why is the following situation impossible? Emily challenges David to catch a $1 bill as follows. She holds the bill vertically with the center of the bill between, but not touching David’s index finger and thumb. Without warning, Emily releases the bill. David catches the bill without moving his hand down- ward. David’s reaction time is equal to the average human reaction time
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