Mathematics

21 May, 03:34

A rocket is launched from the top of a 55-foot cliff with an initial velocity of 138 ft/s.

a. Substitute the values into the vertical motion formula h = - 16t2 + vt + c. Let h = 0.

b. Use the quadratic formula to find out how long the rocket will take to hit the ground after it is launched. Round to the nearest tenth of a second.

Answer Choices:

A. 0 = - 16t2 + 55t + 138; 0.4 s

B. 0 = - 16t2 + 55t + 138; 9 s

C. 0 = - 16t2 + 138t + 55; 0.4 s

D. 0 = - 16t2 + 138t + 55; 9 s

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