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I have a calculus problem (1st year) that I cannot solve I am completely confused:

It says:

We are given that the earth's gravitational acceleration is gE=9.8m/s^2 (downward) and that on Mars gM=3.72m's^2 (downward)

If a projectile is fired upwards from the earth it lands back on earth in 10seconds. How long will the projectile take to land back on the surface of Mars if it is fired upwards with the same initial velocity?

So what Ive done is:

Earth: d(t)=1/2at^2 so x(t)=490m... so would this be the entire distance or just the distance downward, so that the entire distance would be 980?

Then since velocity =d/t its 980/10s =98m/s (or) 490/10 =49m/s... (not sure which one to use)

And d(t)=vt+1/2at^2 So would I just take the values I got.. and plug them and the mars acceleration in this equation and solve for t?? Or I have I done something completely wrong??? Thanks

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# Homework Help: A projectile fired upwards on earth and mars.

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