1.

A body of mass 5 kg starts from the origin with an initial velocity \[\overrightarrow{u\,}\,=\,30\hat{i}+40\hat{j}\,m{{s}^{-1}}\]. If a constant force \[\overrightarrow{F\,}=-(\hat{i}+5\hat{j})N\] acts on the body, the time in which the y?component of the velocity becomes zero is [EAMCET (Med.) 2000]

A.             5 seconds
B.               20 seconds
C.             40 seconds
D.               80 seconds
Answer» D.               80 seconds


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