# physics

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A boy fires a 60 g pebble with his slingshot. The pebble leaves the slingshot at 35m/s

How high above the slingshot will the pebble rise if it's fired straight up?

• physics -

KE =PE
m•v²/2 =m•g•h
h = v²/2•g =(35)²/2•9.8 =62.5 m

• physics -

V2 2 = V1 2 + 2aΔd
0 = 35 2 + 2(-9.8)d
0 = 1225 – 19.6d
-1225 = -19.6d
62.5 = d

The pebble will reach a maximum height of 62.5m [up].

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