Chapter 2.4, Problem 27PP

(a)

To determine

The average speed of the ship.

Answer to Problem 27PP

The average speed of the ship is $0.375\text{m}/\text{s}$ .

Explanation of Solution

Given info:

Distance covered by the ship, $x=1.5\text{m}$

Time taken by the ship to cover the distance, $t=4\text{s}$

Formula Used:

The expression for the average speed of the ship is,

  $s=\frac{x}{t}$

Calculation:

Substitute the values in the above expression.

  $\begin{array}{c}s=\frac{1.5\text{m}}{4\text{s}}\\ =0.375\text{m}/\text{s}\end{array}$

Thus, the average speed of the ship is $0.375\text{m}/\text{s}$ .

(b)

To determine

The average velocity of the ship.

Answer to Problem 27PP

The average velocity of the ship is $-0.375\text{m}/\text{s}$ .

Explanation of Solution

Given info:

Displacement of the ship, $d=-1.5\text{m}$

Time taken by the ship to cover the displacement, $t=4\text{s}$

Formula Used:

The expression for the average velocity of the ship is,

  $v=\frac{d}{t}$

Calculation:

Substitute the values in the above expression.

  $\begin{array}{c}v=\frac{-1.5\text{m}}{4\text{s}}\\ =-0.375\text{m}/\text{s}\end{array}$

Thus, the average velocity of the ship is $-0.375\text{m}/\text{s}$ .