Question On any upgrade, gravity will: Answers Speed your vehicle up. Slow your vehicle down. Not impact your speed. Explanation A vehicle will be slowed down by gravity on any uphill grade. You may need to switch to a lower gear to climb a steep grade. Take a FREE Practice Test Now This questions appears in the following tests: California Knowledge Test Class A , Kentucky Knowledge Test Class A , Hawaii Knowledge Test Class B , Montana Knowledge Test Class B , Ohio Knowledge Test Class B , Oklahoma Knowledge Test Class B , New Mexico Tank , Vermont Tank ,