1. The problem statement, all variables and given/known data If the Earth were suddenly stopped in its orbit, how long would it take for it to collide with the sun?(Regard the sun as a fixed point mass. You may make use of the formula for the period of the Earth's orbit. 2. Relevant equations tau=(4*pi^2*R^3/M*G)^.5 3. The attempt at a solution Should I considered the velocity of the earth before it came to a halt in its orbit? ; the radius between the two bodies are obviously not fixed. What do they mean when they say regard the sun as a fixed point mass?