Why are more firefighters needed to hold the fire hose when the increase of water flow increases the force of the water?

they are needed to withstand the recoil as tons of water are ejectedd at high speed ... like a cannon

A. When the force of the water increases, the reaction force pushing the hose back also increases.

  distance on the y-axis and time on the x-axis.

explanation:

the instantaneous velocity = change in position/time taken

the slope of the graph should give instantaneous velocity.

  slope of a graph = change in value of y -axis / change in values of x -axis

  comparing both the equations

    change in value of y -axis = change in position

  change in values of x -axis = time taken

so position values should be on the y axis and time values should be on the x axis.

distance on the y-axis and time on the x-axis.