Force and Motion - General

A train goes 300 miles at an average speed of 45 miles per hour. 

It takes 1($) hours to go the distance  (Approximate decimal points to the first decimal point)

An object is traveling with a speed of 2 m/s.  Three seconds later its speed is 14 m/s.

It is acceleration during this time is 1($) m/s²

The acceleration of gravity in British units is 1($) ft/s².  The acceleration of gravity in metric units is 2($) m/s²

An object accelerating by 4 m/s².  How far does it go in 3 seconds of acceleration?

distance = 1($) meters

An object falling from rest reaches a speed of 1($) ft/s (or 2($) m/s) after falling 5 seconds.  (Ignore air resistance.)  At this time it has fallen 3($) ft (or 4($) m).

Suppose you are a passenger in a car moving at 55 miles per hour.  You lift a pencil to the ceiling of the car and drop it.  Just before it hits the seat, how fast is it traveling forward? 1($) miles/hour.  Is the downward speed of the pencil increase or decrease? 2($)

One boy pulls on his bicycle with a force of 15 pounds.  His (former) friend pulls on it with a force of 18 pounds in the opposite direction. 

1. What is the net force on the bike? 1($)
2. What is the direction of the net force? 2($)

A force of 3 pounds is exerted toward the east on an object.  At the same time a 4-pound force toward the north is exerted on it. 

1. What is the net force on the object? 1($) pounds
2. Describe the direction of this force.  2($)