Answer:
.a 90 ft/sec b. s=400ft
Step-by-step explanation:
when an object is shot straight upward, the force of gravity which is the earth magnetic pull on an object to its center, acts on it
The basic parameters to be considered are
a=-g, -32ft/sec
s=distance/height attained by the object during its motion against gravity
t=time ,secs
u=initial velocity
V=final velocity ft/sec
from newtons equation of motion,
a) V = u + g*t
So V = 250+ -32*5= 90 ft/sec
it's velocity after 5 seconds has elapsed is 90 ft/sec
b) s =


s=400ft
the height attained after 5 seconds. ..s=400ft