The velocity of a car changes from 10 m/s east to 30m/s east in 4 seconds. what is the acceleration of the car

In an experiment, how can i change human errors? be specific.

The bar of prob. 5/82 is repeated here. the ends of the 0.4-m bar remain in contact with their re- spective support surfaces. end b has a velocity of 0.5 m/s and an acceleration of 0.3 m/s2 in the di- rections shown. determine the angular accelera- tion of the bar and the acceleration of end a.

Why does lightning travel from clouds to the ground?