Please help me
Why were European nations willing to give up their colonies after WWII?

They couldn't afford to keep them anymore.  Colonies were expensive, and cost more to maintain than they produced.

Explanation:

You're using ft/s here, so i had to convert acceleration into ft/s^2 which is 32.174

a)  At its maximum height, v=0 so we use the equation of motion

v = u + at

0 = 49 + (-32.174)t

t = 49 / 32.174

t = 1.52 seconds (2 dp)

b)  Using this time:

s = 1/2 (u + v)t

s = 1/2 (49 +0)1.52

s = (49 x 1.52)/2

s = 37.3 feet (1dp)

c)  The range is 0<=y<=37.3

d)  

There is a limit as as the rocket goes off, it speeds down due to friction, then as it slows down to a halt (at v=0), it turns around and begins to slide. The turnaround point is the limit for the charts.