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An engineer is tasked with determining the strength of the pratt truss above. A crane $($ mass$=m)$ is parked with its centre o

mass directly above the middle of the bridge at joint $K.$ There are joints supported by a pin at A and a roller at $Q.$

Note: For all truss questions, if the answer is a zero force member, leave the drop$-$down menu $($tension$/$compression$)$

blank.

Given the information in the table above, determine:

the force in member $JK,$

$[kN],(3$ sigfig$)$

the force in member $DE,$

$[kN],(3$ sigfig$)$

the force in member $MA.$

$[kN].(3$ sigfig$)$