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h.a.y.l.e.y

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I have a problem where I am told a projectile explodes at a distance L (in the x direction) into 2 pieces of masses 1/4 and 3/4. The smaller mass lands back at the origin. Where does the larger mass land?

I have tried CofM arguments but think I need to find the time it takes to reach the top of its trajectory in order to find how long it takes for the masses to land. By the way, I am not told the angle it is fired at.

Could someone enlighten me further please...

I have tried CofM arguments but think I need to find the time it takes to reach the top of its trajectory in order to find how long it takes for the masses to land. By the way, I am not told the angle it is fired at.

Could someone enlighten me further please...

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