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JEEMAIN and NEET
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NEET PAST PAPERS
>>
2015
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Q)
Two particles A and B, move with constant velocities
→
v
1
and
→
v
2
. At the initial moment their position vectors are
→
r
1
and
→
r
2
respectively. the condition for particles A and B for their collision is :
( A )
→
r
1
−
→
r
2
|
→
r
1
−
→
r
2
|
=
→
v
2
−
→
v
1
|
→
v
2
−
→
v
1
|
( B )
→
r
1
−
→
r
2
=
→
v
1
−
→
v
2
( C )
→
r
1
.
→
v
1
=
→
r
2
.
→
v
2
( D )
→
r
1
×
→
v
1
=
→
r
2
×
→
v
2
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