Suppose that the equation of motion for a particle (where s is in meters and t in seconds) is s=(1/3)t3−7t2+49t+4 . (a) Find the velocity and acceleration as functions of t. Velocity at time t = t^2-14t+49 Acceleration at time t = dne (b) Find the acceleration after 1 second. Acceleration after 1 second: dne (c) Find the acceleration at the instant when the velocity is 0. Acceleration: 0

How much force was applied to an object if was moved 2 meters and the work done on the object was 8 joules? a. 0.25 n b. 4 n c. 6 n d. 16 n

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.

Which form of cell division creates the sperm and egg, resulting in half of the chromosomes as the other cells?