In a competition, an athlete throws a discus though the air. What was the average speed of the discus if it traveled 107 meters over a time of 12 seconds?

8.92 m/s

Explanation:

Distance covered = 107 m

Time = 12 s

Average speed = ?

The relationship between the parameters is given by;

Average speed = Distance covered / Time

Average speed = 107 / 12

Average speed = 8.92 m/s

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied