[填空题]
A 975-kg two-stage r5l(u.z) 3st,knr oxgioi .ze.i6x2ss fcket is traveling at a speed of $5.80\times10^3\mathrm{~m/s}$ with respect to Earth when a pre-designed explosion separates the rocket into two sections of equal mass that then move at a speed of $2.20\times10^3\mathrm{~m/s}$ relative to each other along the original line of motion. Let “A” represent the upper stage (that moves away faster) and “B” represent the lower stage.
(a) What are the speed and direction of each section (relative to Earth) after the explosion? $v'_A$ m/s $v'_B$ m/s
(b) How much energy was supplied by the explosion? [Hint: What is the change in KE as a result of the explosion? $a\times10^8$ a = J
参考答案: 空格1: 6900±2%
空格2: away from the Earth
空格3: 4700±2%
空格4: away from the Earth
空格5: 5.9±2%
