Which of the following has the most kinetic energy? A.
A car traveling at 80 kph.

B.
A tractor trailer traveling at 80 kph.

C.
A cheetah running at 80 kph.

D.
A notorcycle traveling at 80 kph.

The position of a dragonfly that is flying parallel to the ground is given as a function of time by r⃗ =[2.90m+(0.0900m/s2)t2]i^− (0.0150m/s3)t3j^. a: at what value of t does the velocity vector of the insect make an angle of 34.0 degree clockwise from the x-axis? b: at the time calculated in part (a), what is the magnitude of the acceleration vector of the insect? c : at the time calculated in part (a), what is the direction of the acceleration vector of the insect?

=force × distance a. work b. velocity c. pressure d. momentum

Explain the difference in reactivity of the elements based on their electron configurations.