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Q. An artillery shell is fired with the minimal velocity of 430m/s at 67o above the horizontal. To clear an avalanche, it explodes on the mountain side 45s after firing.

What is the X-coordinate relative to its firing point?

Q. Two small spheres spaced 20centimetres apart have equal charge. How many excess electrons should be present on each sphere if magnitude of the force of repulsion between them is newtons?

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