The kinetic energy of a 23.2-g object moving at a speed of 81.9 km/hr is __________ kcal.

Question

Quizplus · Accepted Answer

The kinetic energy (KE) is calculated using the formula KE = 0.5 * m * v^2. First, convert the mass from grams to kilograms (23.2 g = 0.0232 kg) and the speed from km/hr to m/s (81.9 km/hr = 22.75 m/s). Then, calculate KE in joules and convert it to kcal (1 kcal = 4184 J). The calculation gives approximately 1.43 × 10^-3 kcal.

The Kinetic Energy of a 23