Physicshard · Past Paper
An object of mass 1 kg has a kinetic energy of 1 Joule. Its speed is:
A1 m/s
B1.414 m/s
C2 m/s
D0.5 m/s
✓ Correct Answer: B — 1.414 m/s
KE = 1/2 mv^2 => 1 = 1/2 * 1 * v^2 => v^2 = 2 => v = sqrt(2) approx 1.414 m/s.
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