Which equation would best help solve the following problem?

Maria releases a javelin 1.5 meters above the ground with an initial vertical velocity of 22 meters per second. How long will it take the javelin to hit the ground?

–4.9t2 + 22t + 1.5 = 0
–4.9t2+ 22t = 1.5
–4.9t2 + 1.5t + 22 = 0
–16t2 + 22t + 1.5 = 0

Question

Which equation would best help solve the following problem?

Maria releases a javelin 1.5 meters above the ground with an initial vertical velocity of 22 meters per second. How long will it take the javelin to hit the ground?


       –4.9t2 + 22t + 1.5 = 0
       –4.9t2+ 22t  = 1.5
       –4.9t2 + 1.5t + 22 = 0
       –16t2 + 22t + 1.5 = 0

anonymous · Answer

Y = -4.9 t^2 + 22t + 1.5 = 0. Find t
 Solve the quadratic equation for t.
D = b^2 - 4ac = 513.4 --> VD = 22.66
t = 22/9.8 + 22.66/9.8 = 4.56 sec.