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Chapter 2: Q7. (page 41)

Give an example where both the velocity and acceleration are negative.

Short Answer

Expert verified

The velocity and acceleration are negative when the car is traveling in the negative x-direction and speeding up.

Step by step solution

01

Step 1. Meaning of velocity

The rate of change in the displacement of a body is known as the velocity of the body. It is a vector quantity.

In other words, the slope of the displacement versus time graph represents the velocity of the body.

02

Step 2. Citing an example where both the velocity and acceleration are negative

Consider the positive y-axis as the upward direction and the negative y-axis as the downward direction.

When an object is released from a certain height, it falls downward. The object's velocity is downward and negative while it is increasing in magnitude. Hence, the object鈥檚 acceleration is negative.

Therefore, the object falling from a certain height has negative velocity and negative acceleration.

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Most popular questions from this chapter

In which of the following cases does a car have negative velocity and a positive acceleration? A car that is travelling in the

  1. 鈥搙 direction at a constant 20m/s.
  2. 鈥搙 direction increasing in speed.
  3. +x direction increasing in speed.
  4. 鈥搙 direction decreasing in speed.
  5. +x direction decreasing in speed.

You are driving home from school steadily at 95 km/h for 180 km. It then begins to rain, and you slow down to 65 km/h. You arrive home after driving for 4.5 h.

(a) How far is your hometown from school?

(b) What was your average speed?

A ball player catches a ball 3.4 s after throwing it vertically upward. With what speed did he throw it, and what height did it reach?

A car traveling at 95 km/h is 210 m behind a truck traveling at 75 km/h. How long will it take for the car to reach the truck?

A rolling ball moves from x1=8.4cm tox2=-4.2cm during the time fromt1=3.0s to t2=6.1s. What is its average velocity over this time interval?
See all solutions

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