question1on vacation your 1350 kg car pulls a 540, Physics

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question1on vacation your 1350 kg car pulls a 540

Question1

On vacation, your 1350 kg car pulls a 540 kg trailer away from a stop light with an acceleration of 1.90 m/s2.

(a) What is the net force exerted on trailer?

(b) What force does the trailer exert on car?

(c) What is the net force acting on car?

Question2

One rechargeable battery of mass 15.0 g delivers to a CD player an average current of 18.0 mA at 1.60 V for 2.40 h before battery needs to be recharged. The recharger maintains a potential difference of 2.09 V across the battery and delivers a charging current of 13.5 mA for 4.20 h.

What is the effectiveness of the battery as an energy storage device?

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