A train travels at an average speed of 15 m/s.
a) Express its average speed in km/h
b) Find the time in sec taken by the train to travel 750m
15 m/s * 1km/1000m * 3600s/hr = 15*3600/1000 km/hr
750m * 1s/15m = 750/15 s
mujhy yai sawal samaj mai nahi a rha pls help:(
To solve these questions, we will use the following formula:
Speed = Distance / Time
a) To express the average speed of the train in km/h, we need to convert m/s to km/h.
1 kilometer = 1000 meters
1 hour = 3600 seconds
So, to convert m/s to km/h, we will multiply the speed by (3600/1000):
Average speed (km/h) = Average speed (m/s) * (3600/1000)
In this case, the average speed is 15 m/s. Let's substitute this value into the formula:
Average speed (km/h) = 15 m/s * (3600/1000)
Now, let's calculate the result:
Average speed (km/h) = 15 * 3.6 = 54 km/h
b) To find the time taken by the train to travel 750m, we rearrange the formula to solve for time:
Time = Distance / Speed
In this case, the distance is 750m, and the speed is 15 m/s. Let's substitute these values into the formula:
Time = 750m / 15 m/s
Now, let's calculate the result:
Time = 50 seconds
Therefore, it takes 50 seconds for the train to travel 750m.