1. Juan traveled from his house to the park at a constant speed of 20 km/h and he spent 1.5 hours doing this trip. How long was the distance traveled by Juan?
2. Maria was driving her car on her way to her job. She saw the speedometer on her car and marked 55 km/h, one hour later she noticed that her speed was 89 km/h and was worried about passing the speed limit. How much was the acceleration of Maria?
3. Teacher Sebastian noticed that he spends 1 hour traveling from his house to the school everyday on his bicycle. He knows that the distance between his house and the school is 17 km. He wants to know what is his speed when he rides his bicycle?
4. Teacher Camila was driving her car to the school, first she saw that her velocity was 55 km/h and one hour later she noticed that was driving at 89 km/h. Calculate the acceleration of the car (keep in mind the formula for acceleration = V2 - V1/time (velocity 2 minus velocity 1 and all divided by the time. During this class we will always divide by 1)). After calculating the acceleration, teacher Camila wanted to know how much force was applied by the car and she already knew that the car weighs 500 kg. Use the formula from the second law of Newton to calculate the force.
Answers
Answer:
took Markus half an hour to drive home from work. He averaged 34 miles per hour. How far does Markus live from his work?
Solution
We are given that it takes 1/2 an hour for the trip. This is a time:
t = 1/2
We are given that he averages 34 miles per hour. This is a rate:
r = 34
We are asked how few he has traveled. This is a distance. We use the d=rt equation:
d = rt
= (34)(1/2)
= 17
Markus lives 17 miles from work.
Now try one by yourself. If you want to see the answer, put your mouse on the yellow rectangle and the answer will appear.
Exercise 1
The current along the beach is moving towards the south at 1.5 miles per hour. If a piece of debris is placed into the water, how far will the current take it in 6 hours?
9 miles
Example 2
Elena always rides her bicycle at a speed of 15 miles per hour. On Sunday, she goes on a 24 mile bike ride. How many hours does this ride take?
Solution
The speed of 15 miles per hour is a rate. The key words that tell us that this is a rate are "speed" and "miles per hour". We can write:
r = 15
Next, 24 miles is a distance. We have:
d = 24
Now use the d=rt equation to get
24 = 15t
To solve this, divide both sides by 15 to get
t = 24/15
Both are divisible by 3, so this fraction reduces to
t = 8/5 = 1.6
Elena's ride takes 1.6 hours.