Question

physics final review fall 2025
speed and acceleration
formulas: speed or velocity = distance/time
acceleration = (vf - vi)/t

1. what is the difference between speed and velocity?

1. true or false: if an object does not change speed, then there is no way it is accelerating. explain your answer.

1. what is the speed of a jet plane that travels 600 meters in 2 seconds?

1. how many seconds will it take for a satellite to travel 600,000m at a rate of 150 m/s?

1. a car going 22m/s accelerates to pass a truck. five seconds later the car is going 36m/s. calculate the acceleration of the car.

Explanation:

Question 1

Speed is a scalar quantity (magnitude only), while velocity is a vector quantity (magnitude and direction). So the key difference is that velocity includes direction, speed does not.

Acceleration is the rate of change of velocity. Velocity has direction, so if an object changes direction (e.g., moving in a circle at constant speed), its velocity changes, so it accelerates. Thus the statement is false.

Step1: Identify the formula for speed.

The formula for speed (or velocity) is \( \text{speed} = \frac{\text{distance}}{\text{time}} \).

Step2: Plug in the given values.

Given distance \( d = 600 \) meters and time \( t = 2 \) seconds. Substitute into the formula: \( \text{speed} = \frac{600}{2} \).

Step3: Calculate the result.

\( \frac{600}{2} = 300 \) meters per second.

Answer:

Speed is a scalar (magnitude only); velocity is a vector (magnitude + direction).

Question 2