If the speed of the toy car is doubled, its new kinetic energy will be 1.6J
Kinetic energy is the energy an object possesses as a result of its motion. It is given by:
Kinetic energy = (1/2) * mass(m) * velocity(v)²
Given a kinetic energy of 0.4 joules, hence:
(1/2)mv² = 0.4
If the speed is doubled:
K.E = (1/2)m(2v)² = 4 * (1/2)mv² = 4 * 0.4 = 1.6J
If the speed of the toy car is doubled, its new kinetic energy will be 1.6J
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