A 10.0-kg shell is traveling horizontally to the right at 25.0 m/s relative to the ground when it explodes into two fragments, one of mass 3.00 kg and the other of mass 7.00 kg
The lighter fragment goes directly forward, and the explosion releases 1.50 × 103 J of mechanical energy to the fragments. Find the magnitude and direction of the velocity of the heavier fragment relative to the ground just after the explosion. Ignore the effect of any ejected gases.
13.7 m/s to the right
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Which of the following explains why navigators prior to a few hundred years ago found it much more difficult to determine longitude than latitude?
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Why can't we see back the whole way to the Big Bang?
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