【 https:/img.zuoyebang.cc/zyb_a2c4b8a86ffc9c17b4192162142e659f.jpg-3 .已知一质点的运动方程为-|||-x=2t , =2-(t)^2 ,式中t以s计,x和y以m计。-|||-(1)计算并图示质点的运动轨迹;-|||-(2)求出 t=1s 到 t=2s 这段时间质点的平-|||-均速度;-|||-(3)计算1s末和2 s末质点的速度;-|||-(4)计算1s末和2 s末质点的加速度。

https:/img.zuoyebang.cc/zyb_7951f03ce916a2297d2b38782b6a2474.jpg+(a)^2-|||-https

.2times (10)^-3molcdot (L)^-1 b. https:/img.zuoyebang.cc/zyb_e064486c9bc283f85c9

[题目]-|||-设 =x+-|||-A 1/2-|||-B 2-|||-C e-|||-D https:/img.zuoyebang.cc/zyb_e34c8

.7times (10)^8 b. https:/img.zuoyebang.cc/zyb_76c2f9724154ae17af09b9b6b339a4e7.j

https:/img.zuoyebang.cc/zyb_c0fbf0d3ab9a0b30a20e47b6f2b25ba5.jpg-a-|||-C.α^2 D.

4-|||-https:/img.zuoyebang.cc/zyb_218762fe585dbabaa8e3f46957a71dcd.jpg 0 .-1 2-|

https:/img.zuoyebang.cc/zyb_e8bd054ef3dd65e8f324cadbf8b2d8a0.jpg-beta , 且β已知 E.

某天早 https:/img.zuoyebang.cc/zyb_8cea8f9e1e44fee4a53b84b1b8d04a09.jpg.9 点至晚 https

解方程 https:/img.zuoyebang.cc/zyb_7e8f43fce8d9495be1e56a8b33129708.jpg+(e)^2=0.

平面https:/img.zuoyebang.cc/zyb_443e7b4f4bf9228e9f1fec85132a95c9.jpg:2x+3y+4z+1=0