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Problem $06\mathrm{.}010-$ Vertical shearing stress in a beam

For the beam and loading shown, consider section $\backslash ($ n$-$n $\backslash ).$ Given: $\backslash ($ P$=145\backslash$mathrm$\{$kN$\}\backslash ).$

Problem $06\mathrm{.}010.$b $-$ Vertical shearing stress in a beam

Determine the shearing stress at point $\backslash ($ a $\backslash ).$

The shearing stress at point $\backslash ($ a $\backslash )$ is

MPa.