Question

Two particles are thrown horizontally in opposite directions with velocities u and 2u from the top of a high tower. The time after which their radius of curvature will be mutually perpendicular is
A. `(sqrt2) u/g`
B. `2 u/g`
C. `1/(sqrt2) u/g`
D. `1/2 u/g`

Answer 1

Correct Answer - A
a. The radius of curvatures will be mutually perpendicular only
when the velocity vectors will be mutually perpendicular, i.e.,
after the time `t = sqrt(2) u/g.`