physics numericals,
how fast should a body of mass 40 kg run so that its kinetic energy be 720 J .
Answers
Answered by
1
Explanation:
Given, mass m=40kg,K.E=320J,v=?
K.E=
2
1
mv
2
320=
2
1
×40v
2
v
2
=
40
640
=16
v=4m/s
So, the girl of 40 kg should run at 4m/s so that her kinetic energy is 320J.
Answered by
0
Answer:
Given, mass of the man, m=60kg
Kinetic energy of the man, E k=750J
If v is the velocity of the man, then
Ek =1/2 mv²
or v= √2Ek/m=√2×750 /60=5m/s
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