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# M1 Projectiles watch

1. Could anyone tell me where I have gone wrong in this, I have just used the equation of y=Ut+1/2at^2 +h and used it in the upwards direction as positive???

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2. (Original post by Jimmy20002012)
Could anyone tell me where I have gone wrong in this, I have just used the equation of y=Ut+1/2at^2 +h and used it in the upwards direction as positive???

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If you've taken the upwards direction as positive, the second line of your working should be:

3. (Original post by lizard54142)
If you've taken the upwards direction as positive, the second line of your working should be:

Could you just quickly explain why??

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4. (Original post by Jimmy20002012)
Could you just quickly explain why??

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The y component of the velocity is in the downwards direction, which by your definition is negative

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