1) A plane's velocity increases from 40 m/s to 100 m/s over a 10 second interval. What is the plane's average acceleration for this interval? *

average acceleration = 6

Explanation:

Recall that the average acceleration  is defined by the change in velocity from an initial velocity , to a final velocity over the time (t) it took that change to happen. Then, in mathematical terms this is:

with our information this becomes:

b. a lightning bug, plug of grass, and a worm

initial speed when it is dropped is 150 ft/s

now at the same moment the acceleration due to gravity is perpendicular to its velocity

so as we know that

now we have centripetal acceleration a = 32 ft/s^2 as its perpendicular to velocity

while tangential acceleration at the same moment will be zero

so

now radius of curvature is given as

so the radius of curvature just after it is dropped is 703.125 ft