Vikas TU
Last Activity: 8 Years ago
When ball dropped from a point P crosses a point Q in t seconds,
let PQ = QR = x then,
x = 0 + 0.5gt^2.........................(1)
and also final speed would become as:
v = 0 + gt.....................................(2)
For QR,
x = vt’ + 0.5gt’^2
from eqns. (1) and (2) we get,
0.5gt^2 = gtt’ + 0.5gt’^2
hence it is quadatic keeping t constant find t’.
