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Mathematical dynamic dynamics
1. First, bring T=2 into the function and get S = 1 \ 2 * G * 2 = 19.6, so g=9.8, so when t=3, s=44. 1 2, S = 65438.

2. Solution: Set the fast horse to catch up with the slow horse within X days.

240 x = 150 x+( 150 x 12)

240x- 150x= 1800

X=20 A: Fast horses can catch up with thin horses in 20 days.

3. Solution: Suppose two people meet for the first time after X minutes.

350x+250x=400

600x=400

X = 1.5 A: 1.5 hours later they met for the first time.

4.( 1) A: Enter it 40 times, and it's the same.

(2) Answer: If you enter for less than 40 times, you'd better not buy a membership card.

(3) Answer: It is better to buy a membership card if you enter for more than 40 times.

6 is the degree of minute hand walking per minute, and 0.5 is the degree of hour hand walking per minute.

( 1)6x-0.5x=90

(2)6x-0.5x=90+ 180

(3)6x-0.5x= 180

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