A running man crosses a bridge of length 500 meters in 4 minutes. At what speed he is running?
A) 8.5 km/s
B) 7.5 km/s
C) 9.5 km/s
D) 6.5 km/s
Explain step by step also please
Answers
Given: length=500m
time = 4 minutes
We have to find the speed in km/s
- So first, we will convert length which is given in meter to km
500m = 500 × 10⁻³ km
= 0.5 km
- Now, we will convert the time into seconds
4 minutes = 4 × 60 seconds
=240 seconds
- Speed is defined as the distance covered in unit time.
Speed = distance / time
= 0.5/240
= 0.002 km/s
The speed with which the running man crosses the bridge is 0.002 km/s
From the given question the correct answer is:
The speed with which the running man crosses the bridge is 0.002 km/s
Given:
length=500m
time = 4 minutes
to find:
the speed in km/s
Concept used:
Converting the units meter to kilometer
and minutes to second
Speed = distance / time
Solution:
So first, we have to convert length that is given in meters to km
1km =1000 m
converting
500m = 500 × 10⁻³ km
= 0.5 km
Now, we will convert the time into seconds
1 minute = 60 seconds
converting
4 minutes = 4 × 60 seconds
=240 seconds
Speed is defined as the distance covered in unit time.
Speed = distance / time
= 0.5/240
= 0.002 km/s
hence,The speed with which the running man crosses the bridge is 0.002 km/s