Question

A football player has a mass of 110 kg. He is running at a speed of 16 mph, equivalent to 7.2 m/s. What is his kinetic energy when he tackles the opposing team's quarterback? KE = 1/2mv^2
A. 1,851.2 J
B. 5,702.4 J
C. 11,404.8 J
D. 396 J

Answer 1

To calculate the kinetic energy (KE) of the football player, we can use the formula:

KE = 1/2 * m * v^2

where:
m = mass (110 kg)
v = velocity (7.2 m/s)

Substituting the given values into the formula:

KE = 1/2 * 110 kg * (7.2 m/s)^2
= 1/2 * 110 kg * 51.84 m^2/s^2
= 2,840.8 J

Therefore, the kinetic energy of the football player when he tackles the opposing team's quarterback is 2,840.8 J.

The option that is closest to this value is:

A. 1,851.2 J