Solve the Problem $\mathrm { s } = 16 \mathrm { t } ^ { 2 } + 32 \mathrm { t }$

question 23

Multiple Choice

Solve the problem.
-A ball is thrown downward from a window in a tall building. Its position at time t in seconds is $\mathrm { s } = 16 \mathrm { t } ^ { 2 } + 32 \mathrm { t }$ where s is in feet. How long (to the nearest tenth) will it take the ball to fall 140 feet?

• A) 4.4 sec
• B) 3.0 sec
• C) 2.1 sec
• D) 1.9 sec