Will a toy car go faster if the height of the ramp is raised from 20 cm to 50 cm?

Yes, the toy car will likely go faster if the height of the ramp is raised from 20 cm to 50 cm. This is because the higher the ramp, the more potential energy the car will have at the top of the ramp, which will be converted into kinetic energy as it rolls down. The increase in height will result in a greater velocity for the toy car due to the increased gravitational potential energy.