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Calculate the following problem and express your answer with the correct number of significant digits 3 x 16

A jet fighter plane is launched from a catapult on an aircraft carrier.  It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s.  Assuming the acceleration is constant, what is the length of the catapult?

A car accelerates from rest for 5 seconds until it reaches a speed of 20 m/s. What is the car’s acceleration in meters per second per second?

11.2 meters per second is how many miles per hour? (1 mi = 1609 m)

  A car travels 90 km/h.  How long does it take for it to travel 400 km?

An object moves 15.0 m north and then 11.0 m south.  Find both the distance traveled and the magnitude of the displacement vector.

How far does a car travel in 6 s if its initial velocity is 2 m/s and its acceleration is 2 m/s2 in the forward direction?

Vector A has a magnitude 8.0 m at an angle of 30 degrees below the +x axis.  The y-component of A is

In moving a standard computer mouse, a user applies a horizontal force of 6.00×10−2 N. The mouse has a mass of 125 g.   Assuming it starts from rest, what is its speed after moving 0.159 m across a mouse pad? Ignore forces like friction that oppose its motion.

When is the average velocity of an object  equal to the instantaneous velocity?