How many joules of heat are needed to increase the temperature of 250.0g of mercury by 26.0

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 free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

Which one of the following research methods can show cause and effect