The masses of two planets are M and 16M respectively. Their radii are a and 2a respectively and their centres are 10 a apart. A body of mass m is fired straight from the surface of the larger planet towards the smaller planet. What should be the minimum projectile speed so that it reaches the surface of the smaller planet ? Obtain the expression in terms of G, M and a.

The masses of two planets are M and 16M respectively. Their radii are

1.	The masses of two planets are M and 16M respectively. Their radii are a and 2a respectively and their centres are 10 a apart. A body of mass m is fired straight from the surface of the larger planet towards the smaller planet. What should be the minimum projectile speed so that it reaches the surface of the smaller planet ? Obtain the expression in terms of G, M and a.
Answer» ANSWER :`3/2sqrt((5GM)/a)`