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# A worker drops a wrench from the top of a tower 95.0 m tall.?

What is the velocity when the wrench

strikes the ground? The acceleration of gravity is 9.81 m/s2. Round to the nearest hundredth place. Answer in units of m/s.

### 2 Answers

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- MyRankLv 61 month ago
Height (h) = 95m

Velocity (v) = ?

Acceleration due to gravity (g) = 9.81m/sec²

Using conservation of Energy:-

Potential Energy (P.E) = Kinetic Energy (K.E)

= mgh = ½mv²

= 2gh = v²

= velocity (v) = √2gh = √(2 x 9.81 x 95)m²/sec²

= 43.17m/sec ≈ 43.2m/sec

∴ velocity (v) = 43.2m/sec.

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- Anonymous1 month ago
conservation of energy shall apply :

m*g*h = m/2*V^2

mass m cross

V = √2*g*h = √9.806*95*2 = 43.16 m/sec

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