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We know, Kinetic Energy=1/2 * mass * velocity2

Hence, velocity2 = (2*Kinetic Energy)/mass = (2*7.5joule)/(7.9gr)

=(2*7.5joule)/(.0079kg)=1898.73(m/sec)2

Hence, velocity = square root of 1898.73 i.e 43.57 m/sec.

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14y ago
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12y ago

KE = 1/2mass * v^2

so,

98 J =1/2 (mass) *(7 m/s)^2

98 = 1/2 m49

196 = m49

4 kilograms = mass

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15y ago

kinetic energy = (1/2)m(v^2), where m is the mass in kg and v is the speed in m/s. translational kinetic energy = (1/2)m(v^2), where m is the mass in kg and v is the speed in m/s.

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11y ago

KE = 1/2mV2

KE = 1/2(5.0 kg)(5.0 m/s)2

= 63 Joules

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11y ago

Kinetic energy = 1/2 X m X v2

So KE = 1/2 x 5/10 x 25 = 6.25 J

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6y ago

the kinetic energy is 1/2 mass x velocity squared, or 122.5 joules

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13y ago

122.5 joules

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15y ago

.75 kg.

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Q: What is the kinetic energy from the motion of a 5.0 kg object moving at 7.0 ms?
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