Determine the velocity of the running man with respect to car A. A) -55 km/hr
B) -45 km/hr
C) 45 km/hr
D) 55 km/hr

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

What is the kinetic energy of a baseball moving at a speed of 40 m/s if the baseball has mass of 0.15 kg?

Awave has a wavelength of 7 mm and a frequency of 19 hertz. what is its speed?