Decelerating cor, driver having taken his foot off the accelerator and applying
brakes​

Explanation:

In a manual transmission there are three pedals. From left to right, they are: Clutch, Brake, Gas. The clutch is the only pedal you press with your left foot. The other pedals – brake and gas – operate just like they do in an automatic transmission.

Asteroid of the similar sizes are more denser than the comet

Explanation:

The diameter of the nucleus of a typical comet is few kilometers which is comparatively smaller. Also, the nucleus of a comet is formed of ice , and volatile organic compounds or dust. They are relatively less dense.

While the asteroid of the similar size are denser than the comet as they are composed of the stony and/or metallic materials making it denser.