A bullet is fired up from a gun with initial velocity of 1240 feet per second at an initial height of 8feet. Use the formula h= -16t^2+v0t+8 to how many seconds will it take the bullet to hit ground.

Answer 1

Note that

v₀ = 1240 ft/s

h(t) = -16t² + 1240t + 8

Set h(t)=0 and solve for t using the quadratic formula. You will get a negative and a positive solution. Since time starts at t=0, the positive solution is the correct one.