This is for an energy lab where a cart/car is pushed across a track. Data studio

Question

This is for an energy lab where a cart/car is pushed across a track. Data studio is used to collect data.

You have a level track. You push a cart with mass = 0.93[kg]. You measure the initial velocity to be 0.75[m s-1]. 2 seconds later, you measure the velocity to be 0.562[m s-1]. What is the work (reported in mJ) that friction did on the cart?

work = ____________[mJ]

(Use three sig. figs. or N/A if not enough information is given, such as change in position! Remember, that if the system gains energy, then positive work is done; otherwise the system loses energy work done on system < 0.)

Thank you!

Explanation / Answer

Here ,

mass of car , m = 0.93 Kg

initial velocity , u = 0.75 m/s

t = 2 s

final velocity , v = 0.562 m/s

work done on the cart = chnage in kinetic energy

work done on the cart = 0.5 * 0.93 * (0.562^2 - 0.75^2)

work done on the cart = - 0.115 j

the work done on the cart is - 115 mJ

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