Question

How much work must be done on a 24-kg shopping cart to increase its speed

Answer 1

Answer:

The work done by the shopping cart is 180 J  

Explanation:

We have,

Mass of a shopping cart is 24 kg

Initial speed of cart is 1 m/s

Final speed of a cart is 4 m/s

It is required to find the work done by the shopping cart. The work done by an object is also equal to the change in its kinetic energy as per work -energy theorem. It means,

$W=\dfrac{1}{2}m(v^2-u^2)$

m = 24 kg

u = 1 m/s and v = 4 m/s

$W=\dfrac{1}{2}\times 24\times (4^2-1^2)\\\\W=180\ J$

So, the work done by the shopping cart is 180 J.