During a thunderstorm, person hears a thunderbolt four seconds after he sees the lightning. Knowing that the speed of a sound in the air is 340 m/s , what is the distance between the person and the place where the lightning struck from the sky ?
Please help

What is the magnitude of the acceleration vector which causes a particle to move from velocity −5i−2j m/s to −6i+ 7j m/s in 8 seconds. answer in m/s.

Consider two less-than-desirable options. in the first you are driving 30 mph and crash head-on into an identical car also going 30 mph. in the second option you are driving 30 mph and crash head-on into a stationary brick wall. in neither case does your car bounce off the thing it hits, and the collision time is the same in both cases. which of these two situations would result in the greatest impact force?

Can anyone plz answer any of these. even if its one it will