How much steam must be passed into a mixture of ice and water in order to melt 10 g of ice?

Assume you measured the mass of the cart to be (500 ± 1) g and the mass of the additional mass you put on the cart to be (500 ± 1) g as well. since the scale you are using in the lab cannot measure objects heavier than 600g you will have to sum up individual pieces and propagate the error. so what would be the mass and the standard error of the cart and the mass

Acar travels 40m in 8 seconds find the car speed

Complete the sentence to describe the law of conservation of energy. the law of conservation of energy states that energy cannot be created