jee-main 2021 Q77

jee-main · India · session3_20jul_shift2 Vectors Introduction & 2D Dot Product Computation

In a triangle $ABC$, if $| \overrightarrow { BC } | = 3 , | \overrightarrow { CA } | = 5$ and $| \overrightarrow { BA } | = 7$, then the projection of the vector $\overrightarrow { BA }$ on $\overrightarrow { BC }$ is equal to
(1) $\frac { 19 } { 2 }$
(2) $\frac { 13 } { 2 }$
(3) $\frac { 11 } { 2 }$
(4) $\frac { 15 } { 2 }$

In a triangle $ABC$, if $| \overrightarrow { BC } | = 3 , | \overrightarrow { CA } | = 5$ and $| \overrightarrow { BA } | = 7$, then the projection of the vector $\overrightarrow { BA }$ on $\overrightarrow { BC }$ is equal to\\
(1) $\frac { 19 } { 2 }$\\
(2) $\frac { 13 } { 2 }$\\
(3) $\frac { 11 } { 2 }$\\
(4) $\frac { 15 } { 2 }$

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