Apulley system has an ma of 4. how much force would be necessary to pull a 200 newton box

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?

True or false: the revolution of the earth creates day and night as it rotates around the sun

If element x has 99 protons how many electrons does it have