| 12:59p |
из экзаменационных работ
1)If the toy rocket fired straight into air has height of S(t)=-16t2 + 400t feet after t seconds, it will take another (same) t seconds to hit the ground. This is because the gratitude will not change while the toy is fired into air or when it falls to the ground.
2)The signal "-" doesn't mean the negative number, it means the negative direction of the positive direction. |