CBSE Class 12-science Answered
If |𝑎⃗| = 3 and −1 ≤ 𝑘 ≤ 2, then |𝑘𝑎⃗| lies in the interval
(a) [0,6] (b) [−3,6] (c) [3,6] (d) [1,2]
Asked by mohdtayyab682 | 18 Jan, 2023, 10:34: PM
Expert Answer
If , then or
Let
if k = -1 , then ;
if k = 0 , then ;
if k = 1 , then ;
if k = 2 , then
-----------------------------------------
Let
if k = -1 , then ;
if k = 0 , then ;
if k = 1 , then ;
if k = 2 , then
------------------------------------
Hence lies in the interval ( 0, 6 )
Answered by Thiyagarajan K | 19 Jan, 2023, 07:59: AM
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