Question

A shunting engine in a rail yard is working on a straight east-west section of line. First it travels west for 150 s with an average velocity of 4 m/s, to hook up to 10 empty freight cars. Then it pulls the cars east with an average velocity of 3 m/s for 200 s, to a loading area. Calculate the engine's final displacement.

Answer 1

Displacement-1

$\\ \rm\longmapsto Velocity(Time)$

$\\ \rm\longmapsto 150(4)$

$\\ \rm\longmapsto 600m$

Displcaement-2

$\\ \rm\longmapsto 200(3)$

$\\ \rm\longmapsto 600m$

Total displacement=600+600=1200m

Answer 2

Displacement-1

⟼Velocity(Time)

⟼150(4)

⟼600m

Displcaement-2

200(3)

⟼200(3)

⟼600m

Total displacement=600+600=1200m.