Answer:
Average speed of Olympic runner will be 23.08 km/hr
Explanation:
We have given distance d = 27.3 miles
We know that 1 mile = 1.6 km
So 27.3 mile = 
Given time = 2 hour 45 minutes and 35 sec
We know that 1 hour = 60 minutes
So 45 minutes 
We also know that 1 hour = 3600 sec
So 1 sec 
So total time t =
We know that speed 
A release of a large amount of energy
Answer:
A. Mass-extinction events are times in the Earth's history when few species evolve.
Explanation:
The extinction that occurred 65 million years ago wiped out some 50 percent of plants and animals. The event is so striking that it signals a major turning point in Earth's history, marking the end of the geologic period known as the Cretaceous and the beginning of the Tertiary period.
A wide range of animals and plants suddenly died out, from tiny marine organisms to large dinosaurs.
Species go extinct all the time. Scientists estimate that at least 99.9 percent of all species of plants and animals that ever lived are now extinct.
Answer:4.22 J
Explanation:
Given
mass of pitcher 
Force applied 
distance moved 
Applying work-Energy theorem which states that work done by all the forces is equal to the change in kinetic energy of the object
Work done by force 
W=
change in kinetic Energy =

K.E.-0=
K.E.=
Answer:
itsgoing to be aroud 36 speed
Explanation:
bc if u think about it it make sence