# Question #72067

##### 2 Answers

#### Answer:

The mass is

#### Explanation:

Apply the equation of motion

to calculate the acceleration

The initial speed is

The final speed is

The time is

The acceleration is

According to Newton's second Law

The force is

The mass is

#### Answer:

12.897 kg, or 28.433 lb.

#### Explanation:

The formula for force, in Newtons

The formula for acceleration is

So the acceleration is

The formula for force can be rearranged thus:

The required mass is 12.897 kg.