Homework problems: Chapter 2 1. A walker covers 1.8 km in a time of 30 minutes.

Question

Homework problems: Chapter 2

1. A walker covers 1.8 km in a time of 30 minutes. What’s his average speed in m/s?

2. A car ran at a speed of 20 m/s for 10 minutes. What’s the distance it traveled?

3. A train starts from rest and achieves a velocity of 30 m/s in 2 seconds. What’s its acceleration?

4. A car travels with an initial velocity of 12 m/s and acceleration of 2.5 m/s2 for a time of 2 seconds.
a) What’s its speed at the end of this time?
b) What distance does it travel during this time?

5. A car is moving at velocity V0=30 m/s. It starts to slow down with an acceleration -2m/s.
a) How long will it take to stop?
b) What distance does it travel during this time?

I also need a fomula and how to get the way of the answer

Explanation / Answer

Multiple questions I am allowed to answer only 1 question at a time According to the chegg guidelines.

I am answering the first question.

1. A walker covers 1.8 km in a time of 30 minutes. What’s his average speed in m/s?

answer) we know the formula for speed = distance/ time

distance = 1.8 km = 1800 m and time = 30 min = 1800 s

Speed = 1800 m / 1800 s = 1.0 m/s==================answer)

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