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A ball dropped from a point P crosses a point Q in t seconds.the time taken by it to travel from Q to R, if P Q=QR a)t. b)2t. C)(root 2-1)t I want procedure

A ball dropped from a point P crosses a point Q in t seconds.the time taken by it to travel from Q to R, if PQ=QR
a)t.        b)2t.       C)(root 2-1)t
I want procedure

Grade:12

1 Answers

Vikas TU
14149 Points
7 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’.

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