Question

a runner cover 100m in 10s and the remaining 100m in 8s. calculate speed for the first 100m and the second 100m and also calculate the average speed for the whole journey.​

Answer 1

Answer:

first 100m speed=10m/s

second 100m speed=12.5m/s

average speed=11.25m/s

Answer 2

The Speed for the first 100m is 10m/s

Speed for the next 100m is 12.5m/s

The average speed for the whole journey is 11.11 m/s.

Given,

Time taken to cover first 100 mts = 10s

Time taken to cover next 100 mts = 8s

To Find,

Speed of first 100 mts =?

Speed of second 100 mts =?

Solution,

To calculate Speed, the following formula is used,

Speed = distance travelled/ time taken

To calculate Speed for the first 100mts,

Distance D1 = 100mts

Time t1 = 10s

Speed = 100/10

= 10 m/s

Speed for the first 100mts = 10 m/s

To calculate Speed for the next 100mts,

Distance D2 = 100mts

Time t2 = 8s

Speed = 100/8

= 12.5 m/s

Speed for the second 100mts = 8 m/s

To calculate the average speed,

Average speed = total distance travelled / total time taken

Total distance = D1+D2

= 100+100

= 200m

Total time taken = t1+t2

= 10+8

=18s

Average Speed= D1+D2/ t1+t2

= 200/18

=11.11 m/s

Average Speed for the whole journey= 11.11 m/s

Therefore, the Speed for the first 100m is 10m/s

Speed for the next 100m is 12.5m/s

The average speed for the whole journey is 11.11 m/s

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