Aworker drops a wrench from the top of a tower 80m tall. what is the velocity when the
wrench strikes the ground?

The velocity of the wrench is 39.6 m/s.

Explanation:

Given that,

Height of tower = 80 m

We need to calculate the velocity of the wrench when the  wrench strikes the ground

Using the third kinematics equation

Where,

v = final velocity

u = initial velocity

g = acceleration due to gravity

s = traveling distance

Put the value into the formula

Hence, The velocity of the wrench is 39.6 m/s.

Reference :

link

39.6 m/s

Explanation:

Taking down to be positive:

Given:

v₀ = 0 m/s

a = 9.8 m/s²

Δy = 80 m

Find: v

v² = v₀² + 2aΔy

v² = (0 m/s)² + 2 (9.8 m/s²) (80 m)

v = 39.6 m/s

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask

no

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