A cannon shoots a shell straight up at an initial velocity of 300m/s. If air resistance can be neglected, how fast will it be going when it comes back down?

(A) 20m/s. (B) 30m/s. (C) 300m/s.

(D) 600m/s. (E) 500m/s.

Questions     What this question is about
12.3
























































A cannon shoots a shell straight up at an initial velocity of 300m/s. If air resistance can be neglected, how fast will it be going when it comes back down?

(A) 20m/s. --- No.

Unless it has a parachute.

Try again.
Questions     What this question is about
12.3
























































A cannon shoots a shell straight up at an initial velocity of 300m/s. If air resistance can be neglected, how fast will it be going when it comes back down?

(B) 30m/s. --- No.

Don't multiply or divide by anything.

Try again.
Questions     What this question is about
12.3
























































A cannon shoots a shell straight up at an initial velocity of 300m/s. If air resistance can be neglected, how fast will it be going when it comes back down?

(C) 300m/s. --- Yes.
The trip back down is the exact reverse of the trip up.

Check the other answers.
Questions     What this question is about
12.3
























































A cannon shoots a shell straight up at an initial velocity of 300m/s. If air resistance can be neglected, how fast will it be going when it comes back down?

(D) 600m/s. --- No.

The time is doubled but not the speed.

Try again.
Questions     What this question is about
12.3
























































A cannon shoots a shell straight up at an initial velocity of 300m/s. If air resistance can be neglected, how fast will it be going when it comes back down?

(E) 500s. --- No.

You can guess better than that!

Try again.
Questions     What this question is about
12.3