Question

A train has $10$ wagons each of mass $1000kg$ attached to it. They are being pulled by force ${10}^{4}N$. Find out force exerted on last four wagons.

• A. $4\times {10}^{3}N$
• B. $4\times {10}^{4}N$
• C. $5\times {10}^{4}N$
• D. $5\times {10}^{3}N$

Answer 1

Answer: (A)

$4\times {10}^{3}N$

Mass of $10$ wagons = $1000\times 10$

=$10000kg$

So acc. = $\frac{F}{m}=\frac{{10}^4}{10000}=1m/s^2$

So on last, $4$ wagons;

$T=\left(mass\right)\left(acc\right)$

$=(4\times 1000)\left(1\right)$

$T=4000N$

(A) is correct.