Question

multiple select question
select all that apply
identify which of the following can be considered projectiles.
□ a ball that is rolling on a table.
□ a pebble that has been flung into the air by a passing car.
□ an airplane enroute from new york to chicago.
□ a baseball after it has been hit by a bat.

Explanation:

A projectile is an object upon which the only force acting is gravity after it is given an initial thrust. A ball rolling on a table has friction and normal - force in addition to gravity, so it's not a projectile. An airplane has engine thrust and lift in addition to gravity, so it's not a projectile. A pebble flung into the air and a baseball hit by a bat have only gravity acting on them (neglecting air - resistance) after the initial force, so they are projectiles.

Answer:

B. A pebble that has been flung into the air by a passing car.
D. A baseball after it has been hit by a bat.