Answer:
D) Electromagnetic waves
Explanation:
This is because with compression waves and longitudinal waves a medium is required such as air. however in a vacuum this will not work
diagram: see image, x-component: 84.3 N, acceleration: 4.38 m/s^2
(see image for further explanation)
The car's speed is 240km/4hr= 60km/hr.
There's not enough information given in the question to determine its velocity.