How Do You Calculate Hickey's Mass from His Skateboarding Speed Change?

[jack612blue]

Homework Statement

Hickey reached a speed of 35 m/s on his skateboard . Suppose it took 21,000 Joules of net work for Hickey to reach this speed from a speed of 25 m/s. Find Hickey's mass

Homework Equations

Work = Force x Distance Cos(theta)

The Attempt at a Solution

From my believe, the velocity initial is 25 m/s and the final velocity is 35 only m/s. The missing variable is the distance to solve the equation. Is it even possible to find the distance given velocity? Is the problem corrupt?

 

[rl.bhat]

Work done is equal to change in kinetic energy. Work done is given. Use kinetic energy formula and find M.