A cannon shoots a shell straight up at an initial velocity of 300m/s. How long will it take the shell to come back down?

(A) 20s. (B) 30s. (C) 300s. (D) 60s. (E) 500s.



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A cannon shoots a shell straight up at an initial velocity of 300m/s. How long will it take the shell to come back down?

(A) 20s. --- No.
It only loses 10m/s every second
and would still be moving upwards.

Try again.
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A cannon shoots a shell straight up at an initial velocity of 300m/s. How long will it take the shell to come back down?

(B) 30s. --- No.
That is the time needed to go up
but not back down again.

Try again.
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A cannon shoots a shell straight up at an initial velocity of 300m/s. How long will it take the shell to come back down?

(C) 300s. --- No.
It would lose 3000m/s of velocity
in that time.

Try again.
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A cannon shoots a shell straight up at an initial velocity of 300m/s. How long will it take the shell to come back down?

(D) 60s. --- Yes

30s to go up and 30s to come back down.

Check the other answers.
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A cannon shoots a shell straight up at an initial velocity of 300m/s. How long will it take the shell to come back down?

(E) 500s. --- No.

Calculate something, don't just guess.

Try again.
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