Objects in Freefall 1.) A bottle rocket launches with a velocity of 349 m/s straight up at an
acceleration rate of - 9.81 m/s2. How long will it take the rocket to
reach the very top of its ascent?

Explanation is in the file

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-- As far as we know, the forces on the wheelbarrow are balanced.

-- That tells us that the net force on the wheelbarrow is zero, just
as if there were no forces acting on it at all.

-- That tells us that the wheelbarrow's acceleration is zero ... its
speed and direction of motion are not changing.

-- That tells us that the wheelbarrow is moving in a straight line
at a constant speed.  It's very possible that relative to us, the speed
may be zero, but we can't tell that from the given information.