A motorcyclist started a race from START line and from rest, and accelerated with the acceleration of 3 m/s2 for 8 seconds. Then he was moving with a constant velocity for 2 seconds. What was the racer’s position from the START line after 8+2 seconds from the start of the race? The CHoices: 48,72,102,144,288 I REALLY NEED HELP ON THIS

If forces acting on an object are unbalanced, which factors may result fron an unbalanced force? check all that apply

Your target variable is δf, the magnitude of the difference in frequency between the waves emitted from the sonar device and the waves received by the device after reflecting off the whale. write an expression for δf in terms of the relevant frequencies using the subscript notation introduced above.

Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. each step is of uniform height . the mass of each object is a multiple of the base mass : object 1 has mass 4..00m , object 2 has mass 1..96m , and object 3 has mass . when the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. if the objects are then relocated as shown, what is the new total potential energy of the system? each answer requires the numerical coefficient to an algebraic expression. each algebraic expression is given using some combination of the variables , , and , where is the acceleration due to gravity. enter only the numerical coefficient. (example: if the answer is 1..23mgd , just enter 1.23)