Question

force of 10 Newton is acting on a body of mass 2 kg for 3 seconds find its kinetic energy after 3 seconds​

Answer 1

Step-by-step explanation:

W=FS=E

K

=

2

1

mv

2

=10×1=10J

Answer 2

Given:-

• Force applied = 10N

• Mass of Body = 2kg

• Time Taken = 3s

• Initial velocity = 0m/s

To Find:-

• The Kinetic energy after 3s

Formulae used:-

• F = ma

• v = u + at

• K. E = ½ × m × v²

Where,

• v = Final velocity
• u = Initial velocity
• a = Acceleration
• K. E = Kinetic energy
• m = Mass

Now,

First we will find the Acceleration

→ F = ma

→ 10 = 2 × a

→ a = 10/2

→ a = 5m/s²

The Acceleration due to force is 5m/s²

Now,

→ v = u + at

→ v = u + 5 × 3

→ v = 0 + 15

→ v = 15m/s

Hence, The Final velocity is 15m/s

Therefore,

→ K. E = ½ × mv²

→ K. E = ½ × 2 × (15)²

→ K. E = 15 × 15

→ K. E = 225J

Hence, The Kinetic energy after 3s is 225J.