As we know to gain escape speed ,where the kinetic energy must be equals or exceeds the gravity of the planet energy As u know Jupiter is 318 time bigger than earth and radius of 11.2 times than earth square rootimg of both 318/11.2 times the Earth escape speed of 11.2 km/sec we can find out the escape speed $o the escape speed of Jupiter will be = sqrt(318/11.2) x 11.2 = 59.5km/sec