Mary walked north from her home to Sheila's home, which is 4.0 kilometers away. Then she turned right and walked another 3.0 kilometers to the supermarket, which is 5.0 kilometers from her own home. She walked the total distance in 1.5 hours. What were her average speed and average velocity?

Answers

Answer 1

Answer: The answer is speed: 4.7 km/h, velocity: 3.3 km/h.

Distances and time are given:
d1 = 4 km
d2 = 3 km
d3 = 5 km
t = 1.5 h

The speed can be expressed as a distance (d) divided by time (t). The average speed (s) is total distance travelled divided by time:
s = (d1 + d2)/t = (4+3)/1.5 = 7/1.5 = 4.7 km/h

The average velocity (v) is total displacement (d₁) from the starting point divided by time. Since Mary's starting point was home, and she walked to the supermarket, which is 5.0 kilometers from her own home, her displacement is 5 km:
v = d₁/t = 5/1.5 = 3.3 km/h

Answer 2

Answer:

Answer:

Explanation:

THE EXPERT IS WRONG IT IS

4.6 and 3.3

Related Questions

Which of the following is the largest disadvantage of hydropower
List two of the tangible and/or intangible ways in which state governments improve society
A rocket travels vertically at a speed of 1300 km/hr.1300 km/hr. The rocket is tracked through a telescope by an observer located 13 km13 km from the launching pad. Find the rate at which the angle between the telescope and the ground is increasing 3 min3 min after the lift-off.
The phrase terminal velocity can best be defined asa. the velocity of any falling object. b. the velocity of objects with little mass. c. the constant velocity of some falling objects. d. the velocity of something falling from a train terminal.
A diagram that shows the Earth at the center of the solar system is known as a what?1. geocentric model. 2. heliocentric model. 3. universe model. 4. Earth-moon-sun model.

Gas pressure in a closed system is caused by _____.

Answers

Answer:

rapid diffusion of gas throughout the system

Explanation:

It is caused by she system letting off fumes and making gas pressure.

What phase of matter is unable to transfer heat by convection

Answers

Convection is the actual physical motion of heated material rising and cool material sinking.
That's not possible in a solid ... solids don't flow.

A 0.40-kg cart with charge 4.0 x 10-5 C starts at rest on a horizontal frictionless surface 0.50 m from a fixed object with charge 2.0 x 10-4 C. When the cart is released, it moves away from the fixed object. (a) How fast is the cart moving when very far (infinity) from the fixed charge

Answers

Answer:

26.82m/s

Explanation:

Given

Mass = m= 0.4kg

Initial Velocity = u = 0

Charge = 4.0E-5C

Distance= d = 0.5m

Object Charge = 2E-4C

First, we'll calculate the initial energy (E)

E = Potential Energy

PE = kQq / d

Where k = coulomb constant = 8.99E9Nm²/C²

Energy is then calculated by;

PE = 8.99E9 * 4E-5 * 2E-4 / 0.5

PE = 143.84J

Energy = Potential Energy = Kinetic Energy

K.E = ½mv² = 143.84J

½mv² = ½ * 0.40 * v² = 143.85

0.2v² = 143.85

v² = 143.85/0.2

v² = 719.25

v = √719.25

v = 26.81883666380777

v = 26.82m/s

Hence, the object is 26.82m/s fast when the cart moving is very far (infinity) from the fixed charge

What is the hinky pink for cloudy 24 hours?