How fast must a 1000 kg car moving to have a kinetic energy of (a) 2.0 x 10^3 J and (b) 2.0*10^5 J

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Physics

Kaylynn Greer

22 March, 18:14

How fast must a 1000 kg car moving to have a kinetic energy of (a) 2.0 x 10^3 J and (b) 2.0*10^5 J

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Leonard Gallagher · Answer 1

A. Kinetic energy (KE) = 0.5*mass (m) * velocity (v) ²

where KE = 2*10³ J and mass = 1000 kg

v² = 2*10³ / (0.5*1000) = 4

v = 2 m/s

b. KE = 200,000 J and mass=1000 kg

v² = 200,000 / (0.5*1000) = 400

v=20 m/s