Question

complete the table and explain please

Answer 1

it is not seen clear

Answer 2

The following table shows the Kinetic energy from mass and velocity .

Formula :-

Kinetic energy K = 1 / 2 × m × v²

First case

K = ?

m = 28

v = 15

K = 1/2 × m v²

==> K = 1/2 × 28 × ( 15 )²

==> K = 14 × 225

==> K = 3150

The kinetic energy is 3150 J

Second case :

K = 2000

m = 15

v = ?

K = 1/2 × m v²

==> 2000 = 1/2 × 15 × v²

==> 4000 / 15 = v²

==> v² = 4000 / 15

==> v² = 800 / 3

==> v = √800/√3

==> v = 20√2 / √3

==> v = 20√2 × √3 / 3

==> v = 20√6 / 3

The velocity is 20√6/3 m/s

Third case :

K = 9520

m = ?

v = 4

K = 1/2 × m × v²

==> 9520 = 1/2 × m × 4²

==> 9520 = m × 16/2

==> m = 9520 / 8

==> m = 1190

The mass is 1190 kg

Fourth case :

K = ?

m = 10

v = 25

K = 1/2 × m × v²

==> K = 1/2 × 10 × 25²

==> K = 5 × 25²

==> K = 5 × 625

==> K = 3125

The kinetic energy is 3125 J

Hope it helps :)

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