A.t1:t2:t3 |
B.3t1:2t2:t3 |
C.t1:(t1+2t2):(t1+2t2+3t3) |
D.2t1:(3t2+2t1):(6t3+3t2+2t1) |
1 |
3 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
2 |
A.I1<I2,W1=W2 | B.I1<I2,W1<W2 |
C.I1=I2,W1=W2 | D.I1=I2,W1<W2 |
A.4m/s | B.3m/s | C.2m/s | D.1m/s |
A.pA=pB | B.pA>pB | C.fA>fB | D.fA<fB |
A.球先后受到三个力的冲量 |
B.在各个力的冲量中,墙对球的作用力的冲量最大 |
C.在扔球和接球时手给球的冲量方向相反 |
D.全过程球的动量变化量不等于零 |
3 |
5 |
© 2017-2019 超级试练试题库,All Rights Reserved.