Answer:
Step-by-step explanation:
If the distance fallen after seconds is denoted by s(t) and measured in meters, then Galileo's law is expressed by the equation s(t)=[tex]4.9t^2[/tex].
Average velocity=[tex]\frac{change in position}{Time elapsed}[/tex]
=[tex]\frac{s(2.1)-s(2)}{0.1}[/tex]
=[tex]\frac{4.9(2.1)^2-4.9(2)^2}{0.1}[/tex]
=[tex]\frac{4.9(4.41)-4.9(4)}{0.1}[/tex]
=[tex]\frac{21.60-19.6}{0.1}[/tex]
=[tex]\frac{2}{0.1}[/tex]
=[tex]20ms^{-1}[/tex]
Thus, the velocity of the ball after 2 seconds will be [tex]20ms^{-1}[/tex].
Answer:
225 m/seconds
Step-by-step explanation:
The velocity of an object is the rate of change of the displacement of the object with time measured in m/s. It is similar to speed except that it has a direction and is thus a vector.
Mathematically,
Velocity = Displacement/time
Given that the ball drops 450 m in 2 seconds
Velocity of the ball = 450 m/ 2 seconds
= 225 m/sec
