Solve the Problem $X$ Is $s = 4.16 t ^ { 2 } \mathrm {~m}$

question 248

Multiple Choice

Solve the problem.
-The equation for free fall at the surface of Planet $X$ is $s = 4.16 t ^ { 2 } \mathrm {~m}$ with $t$ in seconds. Assume a rock is dropped from the top of a $600 \mathrm {~m}$ cliff. Find the speed of the rock at $t = 5 \mathrm { sec }$ .

• A) \(42.6 \mathrm {~m} / \mathrm { sec }\)
• B) \(41.6 \mathrm {~m} / \mathrm { sec }\)
• C) \(19.8 \mathrm {~m} / \mathrm { sec }\)
• D) \(20.8 \mathrm {~m} / \mathrm { sec }\)

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