An object is dropped (initial velocity is zero) from a height of 40 meters. Assume the acceleration due to gravity a=g=9.81 m/s^2. Calculate: a.) the object's final velocity just before it hits the ground b.) the time it took the object to hit the ground

What should a graph of the velocity vs time look like if it shows an object moving to the left at a constant velocity? Select one: O An upwards curved parabola. O A downwards curved parabola. O A straight line with zero slope that is below the x-axis. O A straight line sloping downward. O A straight line sloping upward. O A straight line with zero slope that is above the x-axis.

At a height of 1250 feet above street level, an item is launched from the Empire State Building. Its starting velocity is zero. The position function s = f(t) = 1250-16t2 may be used to represent the object's height. a) At t = 5 s, check if the item is still descending.b) Calculate the instantaneous velocity of the item at time t = 6 s.c) What is the acceleration of an object moving at constant velocity? Justify your answer.

The position of a particle moving along the x axis is given by x = 3t2 - 12t - 20 m, where t is in s. Determine the following %3D a, average velocity during the time interval t = 2.5 s to t = 4.5 s b. instantaneous velocity at 2s C. average acceleration during the time interval t = 2.5 s to t = 4,5 s d. instantaneous acceleration at 2s e. Is the particle speeding up or slowing down at 3s? Justify your answer.