A1 kg freight car is rolling along a track at 3 m/s. calculate the time needed for a 1000 n force to stop it.

Car will take 1.5 sec to stop

Explanation:

We have given mass of the car m = 10000 kg

Force needed to stop the car F = 1000 N

According to newton's law

As the car stops finally so final velocity v = 0 m/sec

Initial velocity u = 3 m/sec

According to first equation of motion

t = 1.5 sec

d. learned preferences i believe is your answer

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s