Question

What is the work is be done to increase of a velocity of a van from 10m/s to 20m/s. If the mass of van is 2000kg ?

Answer 1

The work done is 3 × 10⁵ J

Explanation:

The work done = Change in Kinetic Energy

$=\frac{1}{2}mv_2^2-\frac{1}{2}mv_1^2$

$=\frac{1}{2}m(v_2^2-v_1^2)$

$=\frac{1}{2}\times 2000\times (20^2-10^2$

$=1000\times (400-100)$ Joule

$=3\times 10^5$ J

Hope this helps.

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Answer 2

Answer:

3×10^5 J

Explanation:

Mass (m) =2000kg

initial velocity ( u) =10 m/s

final velocity ( v) =20 m/s

work done ( w) =1/2 m (v^2- u^2)

=1/2×2000 ( 20^2-10^2)

=1000(400-100)J

=1000×300J

=3×100000J

=3×10^5J