Question

Ball is thrown vertically upwards with a velocity 49m/s .Calculate

1)the maximum height to which it rises
2)the total time it takes to return to the surface of the earth

Answer 1

U=49 m/s
v=0
g= -9.8 m/s
2gh=v^2-u^2
2*-9.8*h=-2401
h=122.5 m

v=u+gt
0=49+(-9.8)t
-49=-9.8t
t=5 sec
So Total time=5+5=10 sec