find the velocities of individual ball at time t . then find the dot product of the velocities .. u will get the time as dot product is 0
as horizontal velocity remains constant .. just multiply it with the derived time
Himanshu Giria which horizontal velocity 3 or 4 moreover dot product is 0 simply bcoz cos theta is 0
Upvote·0· Reply ·2013-06-21 17:45:18