1. The problem statement, all variables and given/known data a.) The ultrasonic motion sensor sends pulses of the ultrasound toward a cart on the low-friction track and determines the distance by the time an echo takes to return. The temperature in the lab is equal to 20 °C. What is the distance between the motion sensor and the cart, if the reflected echo was recorded after 4.17 ms (1 ms = 0.001 s)? b.) The velocity of sound in air is a function of temperature and increases by 0.6 m/s for every degree Celsius (°C) of temperature increase. The temperature in the lab has increased by = 6.11°C, but students did not noticed that change and they were using the sound velocity value for 20°C (343 m/s). The result of the measurements was incorrect. What is the apparent distance for the increased temperature? 2. Relevant equations D=(v*t)/2 3. The attempt at a solution I got the first answer right, getting 0.715781. I tried using the same equation for the second question, but got nothing. Help?