You are the design engineer in charge of the crashworthiness of new automobile models. cars are tested by smashing them into fixed, massive barriers at 56 km/h . a new model of mass 1800 kg takes 0.14 s from the time of impact until it is brought to rest.

Those kind of question have the force and the acceleration as a questions

Explanation:

Calculate the force exerted on the car by the barrier and the acceleration of the motion.

Acceleration is the derive of the velocity so:

Now replacing to find force

80cm/s.

24cm/s.

53.3cm/s.

electrical potential energy =0.072 j

explanation:

electrical potential energy is given by

u= q δv

q= charge=6 c

δv= potential difference and is given by

δv= e d

e= electric field

d= distance=5 mm=0.005 m

δv=2.4 (0.005)=0.012 v

now electric potential energy= u= q δv

u=6 (0.012)

u=0.072 j