It is really hard for me right know

Which statement about covalent bonds is true

When a 5.0kg cart undergoes a 2.2m/s increase in speed, what is the impulse of the cart

Two polarizers are oriented at 40∘ to each other and plane-polarized light is incident on them. if only 16 percent of the light gets through both of them, what was the initial polarization direction of the incident light?