A 500 kg motorcycle accelerates at a rate of 2 m/s .how much force was applied to the motorcycle?

Which statements about tornadoes are true? check all that apply. (a) about 12,000 tornadoes hit the united states every year. (b) a tornado looks like a funnel. (c) tornadoes are deadly atmospheric storms that cause millions in damages each year. (d) tornadoes can reach wind speeds of more than 300 miles per hour. (e) kansas is the state with the most tornadoes. (f) you will always notice a funnel before a tornado strikes.

It is really hard for me right know

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration