A50- kg pole vaulter running ar 10m/s vaults over the bar. her
speed when she is above the bar is 1.0 m/s. neglect airresistance,
as well as any energy absorbed by the pole, anddetermine her
altitude ads she crosses the bar.

5.05 m

Explanation:

Given:

According to the work-energy theorem, work done by the gravitational force will be equal to the kinetic energy change in the vaulter.

Hence, the height of the vaulter is 5.05 m.

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.

i don't understand. explain it clearly