What is the kinetic energy of a 55-kilogram skier traveling at 9.0 meters per second?

(1) 2.5 * 102J

(2) 5.0 * 102J

(3) 2.2 * 103J

(4) 4.9 * 103J

The formula to get the Kinetic Energy is KE=1/2mv^2 where m=mass in kilogram and v=velocity of the object. From you given, we substitute it to the variables. This is the solution: KE=1/2mv^2 KE=1/2 (55kg) (9.0m/s) ^2 KE=1/2 (4455) KE=2227.5J or it can be written in scientific notation as 2.2275x10^3J or closest to your choices is 2.2x10^3J.