Bonny Blair of the United States set a world record in speed skating when

she skated 5.00 x 10' m with an average speed of 12.92 m/s. Suppose

Blair crossed the finish line at this speed and then skated to a stop. If the

work done by friction over a certain distance was - 2830 J, what would

Blair's kinetic energy be, assuming her mass to be 55.0 kg.

Question

Mathematics

Wendy Kim

24 January, 16:53

Bonny Blair of the United States set a world record in speed skating when

she skated 5.00 x 10' m with an average speed of 12.92 m/s. Suppose

Blair crossed the finish line at this speed and then skated to a stop. If the

work done by friction over a certain distance was - 2830 J, what would

Blair's kinetic energy be, assuming her mass to be 55.0 kg.

+2

Answers (1)

Know the Answer?

Eva Hardin · Answer 1

4589.75J

Step-by-step explanation:

Kinetic energy = 1/2 x M x v^2

Given

Mass M = 55.0kg

V = 12.92m/s

Kinetic energy

= 1/2 x 55.0 x (12.92) ^2

= 1/2 x 55.0 x (12.92 x 12.92)

= 1/2 x 55.0 x 166.9

Multiply through

= 9179.5/2

= 4589.75J