Answer:
0.83m/s
Explanation:
Given parameters:
distance = 1000m
time taken = 20min
Unknown:
Speed of the walking person = ?
Solution:
To solve this problem;
Speed =
Time taken should be in seconds;
1 min = 60s
20min = 20 x 60 = 1200s
Speed =
= 0.83m/s
Answer:
The specific kinetic energy of a mass is 0.8 kJ/kg
Explanation:
Given that,
Velocity = 40 m/s
Specific kinetic energy is the kinetic energy per unit mass.
We need to calculate the specific kinetic energy
Using formula of specific kinetic energy


Put the value into the formula


We know that,
1 kJ = 1000 J
or, 1J=0.001 KJ
The specific energy is


Hence, The specific kinetic energy of a mass is 0.8 kJ/kg
It slows down. The molecules/particles aren't as close together, resulting in slower movement.