A block of unit mass is at rest on a uniformly rough inclined plane. From t=0. a time varying force given F = ut + 1/2 * a * t ^ 2 by is applied (u, a are positive constants) on the block directed parallel to the incline and up the incline. Att = 1 unit, the block starts moving. The velocity of the block at t = 2 units is

How are the crust and the inner core alike? a) they are both solid. b) they both have the same temperature. c) they are both under the same pressure. d) they are both very close to the center of the earth.

The man of mass m1 and the woman of mass m2 are standing on opposite ends of the platform of mass m0 which moves with negligible friction and is initially at rest with s = 0. the man and woman begin to approach each other. derive an expression for the displacement s of the platform when the two meet in terms of the displacement x1 of the man relative to the platform.

How does an observation about an object differ from an inference about that object