A body starts with an initial velocity of 10m/s and moves along a straight line with a constant acceleration. When the velocity of the particle becomes 50 m/s the acceleration is reversed in direction without changing magnitude. Find the velocity of the particle when it reaches the starting point.
position when it hits 50m/s:
50^2=10^2+2*a*d solve for a*d.
Now, the reverse trip:
vf^2=50^2 -2ad put the above in, and viola,
Think that out in your mind.posted by bobpursley
-70m/s^2posted by Krishiv and Prateek