问题
选择题
如图，从地面上方某点，将一小球以5m/s的初速度沿水平方向抛出。小球经过1s落地。不计空气阻力，g =10m/s2。则可求出（ ）
A．小球抛出时离地面的高度是5 m
B．小球从抛出点到落地点的水平位移大小是5m
C．小球落地时的速度大小是15m/s
D．小球落地时的速度方向与水平地面成300角
答案
AB
根据平抛运动的规律分析
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如图，从地面上方某点，将一小球以5m/s的初速度沿水平方向抛出。小球经过1s落地。不计空气阻力，g =10m/s2。则可求出（ ）
A．小球抛出时离地面的高度是5 m
B．小球从抛出点到落地点的水平位移大小是5m
C．小球落地时的速度大小是15m/s
D．小球落地时的速度方向与水平地面成300角
AB
根据平抛运动的规律分析
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| Linda's eyes ① not good, so she always ② ③ . But when she goes out with Jim, her boy friend, she doesn't wear her glasses. When she ④ back home, she puts on her glasses again. Linda's mother asks her, " But Linda, why ⑤ you wear your glasses when you are with Jim? He takes you to many beautiful places in his cars, but you can't see ⑥ ⑦ . " "Oh, mother," says Linda, "but I ⑧ nice to Jim when I am not wearing my glasses and he ⑨ nice to me, ⑩ ." |
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