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ICSE Class 9 Answered

Giving reason state if a body having three simultaneous velocities 2u, 3u and 6u can have their resultant velocity zero.
Asked by kiranandroid8 | 20 Oct, 2022, 08:11: PM
Expert Answer
Let a nd b are two velocity vectors. By making these two vectors as sides of parallelogram ,
we can get the sum ( a+ b ) as diagonals of parallelogram as shown in figure .
 
Let sum vector ( a+ B ) = - vector c . hence we can get vector c in opposite direction as shown in figure.
 
sum of these three simultaneous velocity vectors ( a + b + c ) = 0 .
 
As can be seen from figure , to get three simultaneous veclocity vectors such that
their resultant is zero, their mangintudes should be three sides of triangle .
 
with the given three velocity vectors i.e., 2u , 3u and 6u , we can not form a triangle
with sides 2u, 3u and 6u becuase sum of two sides of triangle should be breater than third side.
 
2u +3u not greater than 6u
 
Hence , we can not have three simultaneous vectors as 2u , 3u and 6u to give resultant is zero.
Answered by Thiyagarajan K | 21 Oct, 2022, 10:35: PM
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