Question

multiple select question
select all that apply
which of these situations involve a change in direction of motion?
a ball is dropped from the top of a cliff.
a ball is thrown into the air and later lands on the ground.
a sprinter runs a 100 - meter dash.
an airplane takes off then lands two hours later.

Explanation:

• A ball dropped from a cliff moves only downwards in a straight - line (initially), no change in direction.
• A ball thrown into the air follows a parabolic path. Its direction changes as it goes up and then comes down.
• A sprinter in a 100 - meter dash runs in a straight line (usually) without changing direction.
• An airplane during take - off, flight, and landing changes direction multiple times.

Answer:

A ball is thrown into the air and later lands on the ground.
An airplane takes off then lands two hours later.