Question

If a train 120 m long crosses a man in 15 seconds then the speed of the train is

Answer 1

Answer:

43.2 km/hr

Step-by-step explanation:

In 10 seconds, the train crosses a pole.

The length of the train 120 mts.

In 10 sec. distance covered = 12- mts.

In one sec. = 12010 = 12 m/sec.

Speed = 12×185=2165 = 46.2 kmph

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Answer 2

Answer- speed of train is 8m/s.

Explanation-

Given-Train along 120m crosses a man in 15 seconds.

Find the speed of train.

Solution-Distance is a numerical measurement of how far apart objects or points are. In Physics or everyday usage, distance may refer to a physical length or an estimation based on other criteria. The distance from a point A to a point B is sometimes denoted as |AB|

In everyday use and in kinematics, the speed of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit of time; it is thus a scalar quantity.

Time is the continued sequence of existence and events that occurs in an apparently irreversible succession from the past, through the present, into the future.

So the formula is

Distance=speed $\times$ time

So,

$120m=speed \times 15$

speed $=\frac{120}{15}$

$=8m/s$

The speed of the train is 8m/s.

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