A body is thrown down from a tower of height 192 m with initial velocity 2 m/s find the time taken to hit the groundv velocity just before it hits the ground. the first correct answer will be marked as brainliest❤
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Given : u
y
=0 a
y
=g=9.8m/s
2
Let the projectile's initial velocity be u.
Time of flight T=3 s (given)
Using T=
g
2h
⟹h=
2
gT
2
∴ h=
2
9.8×3
2
=44.1 m
x direction : a
x
=0 ⟹V
x
=u
y direction : V
y
=u
y
+a
y
T
∴ V
y
=0+9.8×3=29.4m/s
Also
V
x
V
y
=tan45
o
=1
⟹ V
x
=V
y
=29.4 m/s
Thus initial speed of the projectile u=V
x
=29.4m/s
solution
y
=0 a
y
=g=9.8m/s
2
Let the projectile's initial velocity be u.
Time of flight T=3 s (given)
Using T=
g
2h
⟹h=
2
gT
2
∴ h=
2
9.8×3
2
=44.1 m
x direction : a
x
=0 ⟹V
x
=u
y direction : V
y
=u
y
+a
y
T
∴ V
y
=0+9.8×3=29.4m/s
Also
V
x
V
y
=tan45
o
=1
⟹ V
x
=V
y
=29.4 m/s
Thus initial speed of the projectile u=V
x
=29.4m/s
solution
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