Four coplanar vectors act at a point. A 20.0N vector is directed 20° to the positive x-axis, a 50.0N vector acts at -30°, a 40.0N vector acts at 150° and the fourth vector is directed at 250°. Obtain the value of the equilibrrant vector( a single vector that cancels the combine effect of the above vectors).​

Which is not true about oxygen-17 and oxygen-18?

An object dropped from cliff falls with a constant acceleration of 10 metre per second square find its speed of two seconds after it was dropped

Asled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slidesa distance d1 down the slope and then covers the distance d2 alongthe horizontal terrain before stopping. find the coefficient ofkinetic friction μk between the sled and the ground, assumingthat it is constant throughout the trip. find the coefficient of kinetic frictionμk. express your answer in terms of someor all of the variables d1, d2, and θ.