Aparticle moving at a velocity of 4.5 m/s in the positive x direction is given an acceleration of 7.1 m/s 2 in the positive y direction for 0.7 s. what is the final speed of the particle? answer in units of m/s.

Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain

You have a pick-up truck that weighed 4,000 pounds when it was new. you are modifying it to increase its ground clearance. when you are finished