Explanation:
Natural selection is the process through which populations of living organisms adapt and change. Individuals in a population are naturally variable, meaning that they are all different in some ways. This variation means that some individuals have traits better suited to the environment than others
Answer:
Answer:B
Explanation:
Because it all stayed consistant
Explanation:
initial velocity= 80km/hr = 22.22 m/s
distance= 40m
Final velocity= 0m/s ( as it needs to be stopped)
<u>Using </u><u>third </u><u>equation </u><u>of </u><u>motion</u><u>,</u>
=> 2as = v² - u²
=> 2a * 40m = 0² - (22.22 m/s)²
=> a = - 493.72/80 m/s²
=> a = - 6.17m/s²
<u>Using </u><u>first </u><u>equation </u><u>of </u><u>motion</u><u>,</u>
=> a = v - u /t
=> -6.17 = 0-22.22/t
=> t = -22.22/-6.17 s
=> t ≈ 3.7 s = stopping time
In a closed system, the loss of momentum of one object is same as________ the gain in momentum of another object
according to law of conservation of momentum, total momentum before and after collision in a closed system in absence of any net external force, remains conserved . that is
total momentum before collision = total momentum after collision
P₁ + P₂ = P'₁ + P'₂
where P₁ and P₂ are momentum before collision for object 1 and object 2 respectively.
P'₁ - P₁ = - (P'₂ - P₂)
so clearly gain in momentum of one object is same as the loss of momentum of other object
The law of energy conservation states that energy cannot be created or destroyed, so choices B to D are immediately invalid. Choice A can explain this occurrence: <u>A. Some of the energy is used to combat friction, and thus is transformed from mechanical energy to heat.</u>