An 1875 kg car is traveling at 22 kg. what is the momentum

Initially, a particle is moving at 5.33 m/s at an angle of 37.9° above the horizontal. two seconds later, its velocity is 6.11 m/s at an angle of 54.2° below the horizontal. what was the particle's average acceleration during these 2.00 seconds in the x-direction (enter first) and the y-direction?

The plum pudding model of the atom states that ?

Could someone me find the answer to this problem.