# PHYSICS HW HELP?

What is the kinetic energy of a 62kg cyclist if she is moving if she is moving on her bicycle at 8.2 m/s?

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• Given,

Mass (m) = 62kg

Speed (v) = 8.2m/sec

Kinetic energy (K.E) = ?

We know that:-

Kinetic Energy (K.E) = ½mv²

= ½ x 62kg x (8.2m/sec)²

= 2084.44J

≈ 2084 J

∴ Kinetic Energy (K.E) = 2084J

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• Ek = 1/2 m v^2  and you should note that v^2 is just v * v

so can you multiply 1/2 * 62 * 8.2 * 8.2  J?  Really?  Somehow I am dismayed at the question. Substituting numbers is easy and isn't physics.  I may be judgmental if I feel that is the best way of helping you to be better.  If you don't like my advice then you are in deep trouble.

• Andrew Smith
Lv 7
1 month agoReport

As mentioned above, there isn't much here to understand. Either you learn your work or you don't. You should have learned this formula somewhere.

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• Anonymous
1 month ago

KE = 1/2 * mass * speed^2

Substitute and solve, easy calc.

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• Kinetic Energy in J if m is in kg and V is in m/s

KE = ½mV²

KE = ½62•8.2² = ____ J

you have a calculator....

• jimmy1 month agoReport
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