Question

Velocity-time graph of a particle of mass 2 kg moving in a straight lines velocity =-20m/sand time=2second Work
done by all the forces on the particle is :
(1) 400 J
(3) -200 J
(2) -400 J
(4) 200 J​

Answer 1

Answer:

W=FS

=m(v-u)/t*vt

=2(-20-0)/2*(-20)(2)

=(-20)(-40)=400J

Answer 2

Answer:

Let's make it.. and the answer is 400 Joule

Explanation:

Velocity=-20 m/sec

Acceleration=0

Time taken=2 sec

Mass = 2kg

As the object is moving in straight line and changing it's position,the kinetic energy will occur.

So,

Kinetic energy= 1/2 m v square

=1/2 × 2 ×-20×-20

=+400 Joule