A bullet fired at a door makes a hole in the door but does not open it. Your finger does not make a hole in the door but does open it. Why?
(a) The bullet is too small.
(b) The force exerted by the bullet is not enough to open the door.
(c) A finger exerts a smaller force but the time interval is much longer.
(d) The bullet goes through the door and does not exert a force at all.
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