Abike (mass of bike + rider = 85 kg) is coasting on a flat road at 10 m/s. what is the kinetic energy of the bike and rider?

You did not show answer options, but that is alright; I will help the best I can. The formula to figure out kinetic energy from the mass and velocity is K = 1/2mv^2 (squared). What you want to do is plug in the values of the equation that you currently have (So, m = 85 and v^2 = 10 m/s). Solving this new equation out ( K = 1/2(85)(10)^2) will give you an answer of 4,250 joules, but then again I do not know what unit the problem wants the kinetic energy to be in.