An object of mass m is released from rest a distance R above the surface of a planet of mass M and radius R Part (a) Derive an expression for the speed with which it hits the planet's surface v. v = ✓ (GM) Part (b) Calculate m R 23 this speed in, assuming M = 22 × 10 kg and S R 21x10 km. v= = 21 × 102/

An object of mass m is released from rest a distance R above the surface of a planet of mass M and radius R Part (a) Derive an expression for the speed with which it hits the planet's surface v. v = ✓ (GM) Part (b) Calculate m R 23 this speed in, assuming M = 22 × 10 kg and S R 21x10 km. v= = 21 × 102/