Solve the following roblems. (9.) A crow bar of length 2 m is used to lift a stone of weight 200 kg. If the fulcrum is set 50 cm apart from the stone, how much effort should be applied to the other end of the crowbar to balance it? ​

If a negatively charged particle is placed at rest in an electric potential field that increases in the positive x-direction, what will the particle do? a. accelerate in the positive x-direction b. remain at rest c. accelerate in the negative x-direction