-- While gaining 2.15 m/s more speed every second, the van
would gain (2.15 x 7) = 15.05 m/s more speed in 7 seconds.
-- We're told that its speed at the end of the 7 seconds
is 20 m/s .
-- So its speed at the beginning of the 7 seconds must have been
(20 m/s - 15.05 m/s) = 4.95 m/s .
Answer:
The terminal velocity is equal to C.
Explanation:
Making the assumption that k and t are positive, we then have that -kt is negative. The value of e^(-kt) will be equal to 1/(e^(kt))
If t increases, e^(kt) will increase exponentially and its reciprocal 1/(e^(kt)) will approach zero.
So, we have:
v(t) = C*(1-0)
v(t) = C*(1)
v(t) = C
Therefore, C is the terminal velocity.
Because gravity is constant
<span>the only force acting in free-fall is gravity which points downward at 9.8 m/s</span>