Question

A train of 10 wagon moves with constant velocity of 40 m/s for 3 minutes. The mass of each wagon is 10000 kg. Calculate net force on each wagon.
A) 500 N
B) 1000 N
C) 0 N
D) Insufficient data to calculate force.

Answer 1

10 wagons move with a constant velocity of 40 m/s for 3 minutes. The mass of each wagon is 10000 kg.

Now, force experienced by each wagon :

$F = m_{wagon} \times a$

$\implies F = 10000\times \bigg(\dfrac{ v - u}{t} \bigg)$

• Since wagons are moving with constant velocity , u = v = 40 m/s. And time = 3 × 60 = 180 sec.

$\implies F = 10000\times \bigg(\dfrac{ 40 - 40}{180} \bigg)$

$\implies F = 10000\times \bigg(\dfrac{ 0}{180} \bigg)$

$\implies F =0 \: N$

So, force on each wagon is 0 N.

Answer 2

Answer:

Answer will be option-C

Explanation:

as the train is moving with constant velocity it's final and initial velocity will be 40 m/s

time is 3 min

initial velocity = 40

final velocity = 40

3 min = 180 seconds

time = 180 sec

Mass of each wagon is 10000

so , we can find the force easily ...

F = M×A

F= 10000 × 40-40/180

F = 10000 × 0/180

F= 0 N