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Question

From the edge of the rooftop of a building, a boy throws a stone at an angle of 25◦ above the horizontal. The

stone hits the ground 4.2 s later, 105 m away from the base of the building. Find the final speed (in m/s) of the stone.


The answer is 38.7m/s. how do you get there.

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New Doc 2019-08-07 08.20.58_1.jpg

It's a problem of Projectile motion ? -
A
0 = 250
H
R
-
-
B
Range of Projectile is given by-
R = 42 sin 20
- - -(4 )
Height of the projectile is given by
H = 42 gin 20
29
- - -( 2 )
29 H
=
Rg
guin...

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