Which of the following situations is impossible?

If the acceleration of an object is zero, then that object cannot be moving.

An object moving in the +x direction experiences an acceleration of +2.0 m/s2. This means the object

When a ball is thrown straight up with no air resistance, the acceleration at its highest point

A 10-kg rock and 20-kg rock are dropped from the same height and experience no significant air resistance. If it takes the 20-kg rock a time T to reach the ground, what time will it take the 10-kg rock to reach the ground?

Two objects are dropped from a bridge, an interval of 1.0 s apart. Air resistance is negligible. During the time that both objects continue to fall, their separation

An object is moving with constant non-zero acceleration in the +x direction. The position versus time graph of this object is

An object is moving with constant non-zero acceleration in the +x direction. The velocity versus time graph of this object is

An airplane increases its speed at the average rate of 15 m/s². How much time does it take to increase its speed from 100 m/s to 160 m/s?

A car is traveling north at 17.7 m/s. After 12 s its velocity is 14.1 m/s in the same direction. Find the magnitude and direction of the car's average acceleration.

A car initially traveling at 60 km/h accelerates at a constant rate of 2.0 m/s². How much time is required for the car to reach a speed of 90 km/h?

A car travels at 15 m/s for 10 s. It then speeds up with a constant acceleration of 2.0 m/s² for 15 s. At the end of this time, what is its velocity?

A jet plane is launched from rest from a catapult on an aircraft carrier. In 2.0 s it reaches a speed of 42 m/s at the end of the catapult. Assuming the acceleration is constant, how far did it travel during those 2.0 s?

A car increases its forward velocity uniformly from 40 m/s to 80 m/s while traveling a distance of 200 m. What is its acceleration during this time?

An object is moving in a straight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

A train starts from rest and accelerates uniformly until it has traveled 2.1 km and acquired a forward velocity of 24 m/s. The train then moves at a constant velocity of 24 m/s for 400 s. The train then slows down uniformly at 0.065 m/s² until it is brought to a halt. The distance traveled by the train while slowing down is closest to

A car starts from rest and accelerates at a steady 6.00 m/s². How far does it travel in the first 3.00 s?

A stone is thrown with an initial upward velocity of 7.0 m/s and experiences negligible air resistance. If we take upward as the positive direction, what is the velocity of the stone after 0.50 s?

A ball is thrown upward with a speed of 12 m/s on the surface of planet X where the acceleration due to gravity is -1.5 m/s² and there is no atmosphere. What is the maximum height reached by the ball?

A ball is thrown downward from the top of a building with an initial speed of 25 m/s. It strikes the ground after 2.0 s. How high is the building, assuming negligible air resistance?

To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it to hit the water. If the height of the bridge is 41 m, how long will it take for the stone to hit the water? Neglect air resistance.

A car is traveling at 26.0 m/s when the driver suddenly applies the brakes, causing the car to slow down with constant acceleration. The car comes to a stop in a distance of 120 m. How fast was the car moving when it was 60.0 m past the point where the brakes were applied?