A cross country runner runs 10 km in 40 minutes. what is his average speed

◈ Average speed is measured as the ratio of total distance travelled to the total time taken.

Given : d = 10km and t = 40min

To Find : Vav

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፨ Conversion :-

60 min = 1 h

40 min = 40/60 = 2/3 h

force is mass*acceleration.

we have a very small mass: 11.4*0.001 kg

if we want 0.035n of force, we need an acceleration:

0.035 = 11.4*0.001*a

a = 0.035/(11.4*0.001) m/s^2

their crystal patterns have been disrupted by stress