Question

Nina runs at a speed of 10 m/s. Her mass is 80 kg. What is Nina's energy as she runs?

a) 800 J
b) 400 J
c) 1,200 J
d) 8,000 J

Answer 1

Nina's kinetic energy, with a mass of 80 kg and a speed of 10 m/s, is calculated as 4000 J, which means none of the provided answer options are correct.

Step-by-step explanation:

The student's question involves calculating the kinetic energy of an individual running. Kinetic energy (KE) is given by the formula KE = (1/2)mv², where m is mass and v is velocity. For Nina, who runs at a speed of 10 m/s and has a mass of 80 kg, her kinetic energy can be calculated as follows:

KE = (1/2) × 80 kg × (10 m/s)² = 0.5 × 80 × 100 = 4000 J or 4 kJ. Therefore, none of the given options (a, b, c, d) are correct, as the actual kinetic energy is 4000 J.