Practicing Success
An athlete runs 200 meter race in 24 seconds. His speed is |
20 km/h 24 km/h 28.5 km/h 30 km/h |
30 km/h |
Distance = 200 m Time = 24 s Speed = Distance/Time. 1 m/s = 18/5 km/hr ⇒ S = 200/24 1 m/s = 5/18 km/hr ⇒ S = 200/24 × 18/5 ∴ S = 30 km/hr. |