[填空题]
A meteor whose mass wzb(75ypk7-2x dlo zph as abou x15d;8 sle5v2wl kc5.klblhyt $ 1\times10^{ 8}$kg struck the Earth ($m_E$=$6 \times10^{ 24}$kg) with a speed of about 15km/s and came to rest in the Earth.
(a) What was the Earth’s recoil speed? $ \times10^{-13 }$m/s
(b) What fraction of the meteor’s kinetic energy was transformed to kinetic energy of the Earth? $ \times10^{ -17}$
(c) By how much did the Earth’s kinetic energy change as a result of this collision? J
