Pomegranate is thrown from ground level straight up into the air at time t=0 with velocity 176 feet per second. its height in feet at t seconds is f(t)=−16t2+176t. find the time it hits the ground and the time it reaches its highest point.

Position is given as function of time

now rate of change in position with time is given as

so when it reached to highest point its velocity will be zero

so it will take 5.5 s to reach the highest point

Also we know that it took same time to reach back on ground too

So total time taken by the object to come back is given by

so it will take 11 s to reach back on ground

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.