1D Kinematics

At one instant an object in free fall is moving downward at 50 m/s. One second later its speed is

• 100 m/s

• 50 m/s.

• 55 m/s.

• 60 m/s.

At one instant a heavy object in air is moving upward at 50 m/s. One second later its speed is approximately

• 50 m/s

• 40 m/s

• 55 m/s

• 100 m/s

Jogging Jake runs at 4 m/s along a train flatcar that moves at 10 m/s in the same direction. Jake's speed relative to the ground is

• 6 m/s

• 10 m/s

• 14 m/s

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When you walk at an average speed of 4 m/s, in 5 s you'll cover a distance of

• 2 m

• 10 m

• 15 m

• 20 m

A vehicle undergoes acceleration when it

• speeds up

• slows down

• changes direction

• all of these

While a car travels around a circular track at a constant speed, its

• acceleration is zero

• velocity is zero

• inertia is zero

• none of these

A car's speed 3 seconds after accelerating from rest at 2 m/s^2 is

• 2 m/s

• 3 m/s

• 4 m/s

• 6 m/s

Ten seconds after starting from rest, a car is moving at 40 m/s. What is the car's acceleration?

• 0.25 m/s^2

• 2.8 m/s^2

• 4.0 m/s^2

• 10 m/s^2

While an iron block near the Earth's surface is in free fall, it undergoes an increase in

• speed

• acceleration

• both of these

• neither of these

If an object falling freely were somehow equipped with an odometer to measure the distance it travels, then the amount of distance it travels each succeeding second would be

• constant

• less and less each second

• greater than the second before

• doubled