Question

Q. The mass of an athlete is 40kg. He can
cover a distance of 150m in maximum of
15 sec and minimum of 10 sec then the
range of his kinetic energy is
1) 2000J – 4500J 2) 4500 J – 9000J
3) 2000 J - 9000J 4) 4000 J – 6000 J
​

Answer 1

Step-by-step explanation:

kinetic energy= 1/2 m (v1sq-v2sq)

v1=150/15=10m/s^2

V2=150/10=15m/s^2

therefore,

K.E=1/2×40×(100-225)

=20×100-20×225

That is,it's KE varies from 2000j -4500j

Answer 2

Answer:

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Step-by-step explanation:

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