In Figure B1, a stone is projected to a cliff of height $h$ with an initial speed of $30 m / s$ directed at angle $?_{0} = 5 0^{?}$ above the horizontal. The stone strikes at $A, 4 s$ after launching. (a) Find the height $h$ of the cliff. (6 marks) (b) Find the maximum height $H$ reached above the ground. (6 marks) (c) Find the velocity $v$ of the stone, in unit-vector notation, just before impact at $A$ . (8 marks)

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In Figure B1, a stone is projected to a cliff of height

h

with an initial speed of

30 m / s

directed at angle

?_{0} = 5 0^{?}

above the horizontal. The stone strikes at

A, 4 s

after launching. (a) Find the height

h

of the cliff. (6 marks) (b) Find the maximum height

H

reached above the ground. (6 marks) (c) Find the velocity

v

of the stone, in unit-vector notation, just before impact at

A

. (8 marks)

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