ANSWERS
• Height after 2 seconds: ,190 ft
,
• Velocity after 2 seconds: ,30 ft/s
Step-by-step explanation
The height of the rock is given by the equation,

To find the rock's height after 2 seconds we have to replace t with 2 in the equation above and solve,

Hence, the height of the rock after 2 seconds is 190 ft.
The velocity of the rock is the derivative of the height,

After 2 seconds,

Hence, the velocity of the rock after 2 seconds is 30 ft/s.