The kinetic energy of a 23.2-g object moving at a speed of 81.9 km/hr is ________ kcal. A)1.43 × 10^-³ B)6.00 C)1900 D)454 E)0.0251

Question

Quizplus · Accepted Answer

The kinetic energy (KE) is calculated using the formula KE = 0.5 * m * v^2. First, convert the mass to kg (23.2 g = 0.0232 kg) and the speed to m/s (81.9 km/hr = 22.75 m/s). Then, KE = 0.5 * 0.0232 kg * (22.75 m/s)^2 = 6.02 J. Converting joules to kcal (1 kcal = 4184 J), KE ≈ 1.43 × 10^-3 kcal.

The Kinetic Energy of a 23