The velocity of a particle moving along the x-axis varies in time according to the expression vx(t) = (40 – 5 t2) m/s, where t is in

seconds.

Find the average acceleration in the time interval t=0 to t=2.0s.

Determine the acceleration at t = 2.0 s.

When a neutral charge, comes into contact with a positive charge they repel each other nothing happens the neutral charge becomes negative they attract each other

Which of the following bonds would be most polar? a. c-i b. c-br c. c-cl d. c-f e. c-o

Astone is thrown with a speed v0 and returns to earth, as the drawing shows. ignore friction and air resistance, and consider the initial and final locations of the stone. which one of the following correctly describes the change δpe in the gravitational potential energy and the change δke in the kinetic energy of the stone as it moves from its initial to its final location? options a.δpe = 0 j and δke = 0 j b.δpe is positive and δke is negative c.δpe = 0 j and δke is positive d.δpe is negative and δke is positive e.δpe = 0 j and δke is negative