SOLUTION: a particle is projected from ground level so that its height above the ground after t second is given by 20 t-5t square meters. after how many seconds is it 15 meter above the grou
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Question 970736: a particle is projected from ground level so that its height above the ground after t second is given by 20 t-5t square meters. after how many seconds is it 15 meter above the ground? can you explain briefly why there are two possible answers?
Answer by macston(5194) (Show Source): You can put this solution on YOUR website!
.
ANSWER:
The particle reaches 15 meters on the way up after 1 second,
and passes 15 meters again after 3 seconds on the way down.
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