See for examples in the compulsory book of senior high school mathematics.

Fireworks are set off at high altitude (above the ground 18m), so c= 18.

∫ The displacement formula of object motion is x=v0t+0.5gt? , v0= 14.7 (this is the initial velocity) g=-9.8 (because the object decelerates upward, the acceleration is negative, which is the acceleration of gravity).

∴h(t)=-4.9t？ +14.7t+ 18 (the analytical formula here can be regarded as h(t)= 14.7t-4.9t? + 18)

1998 How many points did the children's class in the experimental class of extraordinary education in Northeast Yucai School get in the math test?

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