___________ is the shirt? Twenty yuan.[ ]
A. How many
B. How much
C. How old
答案:B
小军同学把篮球从离地5m高处向离篮球4m远的竖直墙以8m/s的速度水平抛出,不计空气阻力,求:
(1)篮球碰墙点离地面的高度.
(2)要使篮球不碰到墙,篮球的初速度必须小于多少m/s?
人的平常智力为()
A.75~110
B.80~110
C.80~115
D.85~115
E.90~115