During the course of trajectory, the horizontal component of the velocity is? constant increasing decreasing negative

Agymnast dismounts off the uneven bars in a tuck position with a radius of 0.3m (assume she is a solid sphere) and an angular velocity of 2rev/s. during the dismount she stretches out into the straight position, with a length of 1.5m, (assume she is a uniform rod through the center) for her landing. the gymnast has a mass of 50kg. what is her angular velocity in the straight position?

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?