Question

A runaway train car that has a mass of 1.550×104kg travels at a speed of 5.35m/s down a track. Compute the time required for a force of 1.50×103N to bring the car to rest.

Answer 1

Answer:

55.15 sec.

Explanation:

Given that the force = $1.50\times 10^3$ N

We know, Force = mass × acceleration

So,

Acceleration = $\frac{Force}{Mass}= \frac{1.50\times10^3}{1.550\times10^4} = 0.097 ms^-^2$ is the negative acceleration produced by the force.

Now, using formula $v=u-at$

As the car finally stops so $v$ will be zero.

So,

$0=5.35-0.097\times t$

Thus, $t= \frac{5.35}{0.097}$ = 55.15 sec.

So, the time required for the force to bring the car to rest will be 55.15 seconds.