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A shell is fired from a cannon with a sp...

A shell is fired from a cannon with a speed of `100 m//s` at an angle `30^(@)`with the vertical (`y`-direction). At the highest point of its trajectory, the shell explodes into two fragments of masses in the ratio `1:2`. The lighter fragment moves vertically upwards with an initial speed of `200 m//s`. What is the speed of the heavier fragment at the time of explosion?

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