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100% Because of long-distance travel, the probability of coming to a restaurant to eat again is very low, and the validity period of the meal coupon will not be very long, so the 20 yuan meal coupon given is equal to nothing.
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If the 20 yuan meal coupon can be used immediately, then the person's meal fee is B 60% of the original meal cost 30 yuan was spent, and the original meal cost is 50 yuan. 3/5 of the original
It means that you are subconsciously going to the toilet and wetting the bed without waking up.
Only horizontal throws can have the longest distance.
h=1/2gt^2 >>>More
No air resistance is assumed:
According to v=gt, the time is: 4 seconds for the round trip; >>>More
The first case: 15m above the throw point.
The equation is: 20t-5t 2=15 >>>More
From the starting point down to 15m is the time SQRT(7)-2; Coupled with the above round-trip time, 4s is a total of 2+sqrt(7) seconds.