A Projectile Is Shot Upwards from the Surface of the Earth

question 42

Multiple Choice

A projectile is shot upwards from the surface of the earth with an initial velocity of 108 meters per second. The position function is $s ( t ) = - 4.9 t ^ { 2 } + v _ { 0 } t + s _ { 0 }$ What is its velocity after 7 seconds?

• A) The velocity after 7 seconds is \(181.7\) meters per second.
• B) The velocity after 7 seconds is \(- 142.3\) meters per second.
• C) The velocity after 7 seconds is \(39.4\) meters per second.
• D) The velocity after 7 seconds is \(73.7\) meters per second.
• E) The velocity after 7 seconds is \(- 176.6\) meters per second.

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