Question

help please . its too urgent

Answer 1

initial velocity, u = 19.6 m per sec
final velocity, v = 0 (becoz it reaches the ground after 5 sec)
time, t = 5 sec
acceleration, a = - 9.8 m per sec square
by using formula,
h= ut + 1/2 ×at ^2
h= 19.6 × 5 + 1/2 × - 9.8 × 5^2
h= 98- 4.9 × 25
h=24.5m
height=24.5 m

now to find v, we will use formula v = u + at
v= ?
u = 19.6
a= -9.8
t = 5
v= 19.6- 9.8 × 5
v= 19.6 - 49
v= -29.4 m per sec

hope this would help u......