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Q. A cannonball is fired from a cliff 140m high downward at an angle of 27 degrees with respect to the horizontal. if the cannon's muzzle velocity is 34 m/s, what is the cannon ball's speed when it hits the ground?

Q. in a certain vacuum tube,electron evaporates from a hot cathode at a slow steady rate and accelerates from rest through a potential difference of 45V then they travel 28cm.as they passes through an array of slits and fall on a screen to produce an interference pattern.if the beam current is below a certain value, only one electron at a time will be in flight in the tube.What is the value? in this situation, the interference pattern still appears showing that each individual electron can interfere with itself.

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