A child throws a rock into the river. The rock leaves the child's hand with an initial upward velocity of 6 meters per second. If the rock is 1.25 meters off the ground when it leaves the child’s hand, about how many seconds will it take for the rock to hit the water?

Question

anonymous · Answer

Same as Last problem, plug in numbers

anonymous · Answer

X0=1.25
V0=6

amistre64 · Answer

h(t) = -gravity(t^2) + initial velocity(t) + intial height

h(t) = -4.9t^2 +6t +1.25

amistre64 · Answer

wolfram gives us an answer of about 1.41 seconds.

amistre64 · Answer

http://www.wolframalpha.com/input/?i=-4.9t^2+%2B6t+%2B1.25