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The displacement versus time for a certain particle moving along the x axis is shown. The average velocity in the time intervals  0 to 2 s is :

A force on a particle is conservative if:

An object sits on a frictionless surface. A 16-N force is applied to the object, and it accelerates at 2.0 m/s2. What is the mass of the object?

A car rounds a 20-m radius curve at 10m/s. The magnitude of its acceleration is:

True or False: Electric forces between two charged objects increases with increasing quantity of charge on the objects.

If the net work done on an object is zero, then the object’s kinetic energy

A driver, traveling at 22 m/s, slows down her 2000 kg car to stop for a red light.  What work is done by the friction force against the wheels?

Neglecting the effect of air resistance a stone dropped off a 175-m high building lands on the ground in:

A 7.6 kg chair is pushed across a frictionless floor with a force of 42 N that is applied at an angle of 22° downward from the horizontal. What is the magnitude of the acceleration of the chair?

Two spacemen are floating together with zero speed in a gravity-free region of space. The massof spaceman A is 120 kg and that of spaceman B is 90 kg. Spaceman A pushes B away from him with B attaining a final speed of 0.5m/s. The final recoil speed of A is: