Asprinter had a mass of 80 kg and a kinetic energy of 4,000 j. what is the sprinters speed?

K.E =   1/2mv²

4000 =   1/2 ˣ 80 ˣ  v²

4000 ˣ 2 = 80 v²

8000 = 80 v²

8000/ 80 =v²

100  = v²

Taking square root on b/s

√100 = √v²

10 = v

their crystal patterns have been disrupted by stress

1.195000

explanation:

total mass=0.0117+0.0137+0.0881+0.0111

total mass= 0.01172kg

total velocity = 0.283-0.743+0.871-0.799+0.155+0.637+0.301=0.102

momentum=mv=0.1172*0.102=1.195000//