3 years ago

An object of mass 20 kg is dropped

Social Studies

1 answer:

8090 [49]3 years ago

8 0

Answer: PE = 800j, KE = 800J

Explanation:

To calculate the potential energy, we use the formula

Potential Energy = Mgh

M = 20kg, g = 10m/sˆ2 , h = 4m

=20 × 10 × 4

=800J

At the maximum height S = 4 and the initial velocity u = 0 The acceleration g = 10m/sˆ2

Using the third equation of motion

vˆ2 = uˆ2 + 2as

= 0ˆ2 + 2 × 10 × 4

vˆ2 = 80

Kinetic Energy (KE) is given by

KE = ½ mvˆ2

= ½ × 20 × 80

=800J

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