A 45kg pole-vaulter running at 12 ms vaults over the bar., Ask an Expert

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Q. A uniform electric field of magnitude 370 N/C pointing in positive x-direction acts on an electron, which is initially at rest. The electron has moved 3.60 cm. (i) what is the work done by the field on the electron? (ii) What is the velocity of the electron?

Q. A 45kg pole-vaulter running at 12 m/s vaults over the bar. Her speed when she is above the bar is 1.90m/s. Avoid air resistance and determine her height as she crosses the bar.

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