[填空题]
How much work is required to stop an )b0: wmar jau(flxqz 8p,g/9*9utpa felectrb8 kgqq erct*x:1dd iv/11qv7 on $\left(m=9.11\times10^{-31}\mathrm{~kg}\right)$ which is moving with a speed of$1. 90\times 10^{6}\mathbf{m/ s}$ ? $\boxed{a\times10^{b} \mathrm{J}}$ a = b =
