Explain why A spinning cricket ball in air does not follow a parabolic trajectory

A projectile is fired with velocity making an angle theta with the horizontal. Show that it follows a parabolic trajectory. Obtain an expression for the maximum height attained by it.

Explain why bending a wire does not affect electrical resistance.

Explain why:- a cricketer moves his hands backwards while holding a catch.

Shows are several curves. Explain with reason, which ones amongest them can be possible trajectories traced by a projectile (neglect air friction).

Explain why phosphorus forms PCl_5 whereas nitrogen does not form NCl_5 .

Explain why both N and Bi do not form pentahalides but Phosphorus does?