If an object is at rest 500 m above the ground and it falls to the ground, what is its velocity when it hits the ground (neglecting air resistance)?

A. 70 m/s
B. 99 m/s
C. 9810 m/s
D. 9.81 m/s
E. Insufficient information to solve


A. Incorrect. You forgot a factor in your calculation. Reexamine your work.
B. Correct. All potential energy will have been transformed to kinetic energy at the ground.
C. Incorrect. You made a mistake in your algebra. Check how you solved for velocity.
D. Incorrect. The number (9.81) is the common acceleration due to gravity, but the units are incorrect for that. It is also not the answer to the question, which seeks velocity.
E. Incorrect. This problem can be solved from the given information. Note that answer is the same for any mass object, so the mass of the object doesn’t need to be known.

Trades & Technology

You might also like to view...

An engine has a warped cylinder head. Technician A says that this could be caused by running the engine with a faulty thermostat. Technician B says that this could be because the engine was overheated. Who is right?

A. ?Technician A only B. ?Technician B only C. ?Both A and B D. ?Neither A nor B

Trades & Technology

What unit contains a hold-in winding and a pull-in winding?

A) Armature B) Ignition switch C) Field coil D) Starter solenoid

Trades & Technology

If Rf opens in an inverting amplifier

A) there is no output B) the gain is unity C) the gain increases D) it is usually driven into saturation

Trades & Technology

Which type of duct system typically has the air handler located below the conditioned space and the ductwork running around the perimeter of the space?

A. plenum-type duct system B. extended-type duct system C. reducing-extended-plenum duct system D. perimeter duct system

Trades & Technology