A49 kg pole vaulter running at 10 m/s vaults over the bar. her speed when she is above the bar is 0.7 m/s. the acceleration of gravity is 9.8 m/s2. find her altitude as she crosses the bar. neglect air resistance, as well as any energy absorbed by the pole.

Height will be 5.127 m

Explanation:

We have given mass m = 49 kg

Speed over the bar v = 10 m /sec

Acceleration due to gravity

Kinetic energy on the ground

Potential energy on the ground (as height will be zero )

Speed above the bar = 0.7 m /sec

So kinetic energy above the bar

Potential energy above the bar = mgh

From energy conservation

Total kinetic energy = total potential energy

So

unlike poles attract