A train engine pulls out of a station along a straight horizontal track with five identical freight cars behind it, each of which weighs 88.0 kN. The train reaches a speed of 13.0 m/s within 6.50 min of starting out. Assuming the engine pulls with a constant force during this interval, and ignore air resistance and friction on the freight cars. Find the tension in the coupling between cars 2 and 3.

Question

A train engine pulls out of a station along a straight horizontal track with five identical freight cars behind it, each of which weighs 88.0 kN. The train reaches a speed of 13.0 m/s within 6.50 min of starting out. Assuming the engine pulls with a constant force during this interval, and ignore air resistance and friction on the freight cars. Find the tension in the coupling between cars 2 and 3.
 Give answer in kN please!!!

bobpursley · Answer

Three cars are being pulled (cars, 3,4,5) tension= massthreecars*acceleration so figure acceleration. acceleartion= changevelocyt/time change minutes to seconds in that.

Anonymous · Answer

isnt the velocity already 13.0 m/s for all of them and a=9.8 ??? bobpursley are you sure cuz your confusing me!!!