What are the instantaneous speeds of car A and car B at the zero-second mark?

Karen is running forward at a speed of 9 m/s. she tosses her sweaty headband backward at a speed of 20 m/s. the speed of the headband, to the nearest whole number relative to a stationary observer watching karen

Which accounts for an increase in the temperature of a gas that is kept a constant volume

Acar travels 40m in 8 seconds find the car speed