Level 2 A sprinter with a mass of 50 kg is moving forward at a speed of 2 m/s. What's the sprinter's kinetic energy from this forward motion?

A10nc charge sits at a point in space where the magnitude of the electric field is 1500 n/c. what will the magnitude of the field be if the 10 nc charge is replaced by a 20 nc charge? assume the system is big enough to consider the charges as small test charges.