Question

A 900kg compact car is moving at a certain speed. If it's kinetic energy is 3,20,000 J, find the velocity at which the car is travelling

Answer 1

Answer:

mass = m = 900kg

K.E = 320000J = 320×10³J

velocity = v = ?

_______________

K.E = mv²/2

2×K.E = mv²

2×320×10³ = 9×10²×v²

640×10³/9×10² = v²

640×10^3-2/9 = v²

640×10¹/9 = v²

64×10²/9 = v²

√64×10²/9 = v

8×10/3 = v

80/3 = v

26.67m/s = v

______________________

so car's velocity is 26.67m/s

Explanation:

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Answer 2

Answer:

v = 80 / 3 m/s

Explanation:

Kinetic energy =  mv^2 / 2

320000 = 900/2 * v^2

6400/9  = v^2

v = 80 / 3 m / s