John see hua running towards him at 11m/s. while running, hua throws a ball to john at 5m/s. what is the speed of the ball as observed by john?

35 grams of salt is dissolved in 500 grams of total solution. what is the percent by mass of salt?

Aplayer takes mostly slap shots and has a crouched skating style what stick design would you choose for the player

The number of loops in the primary coil divided by the number of loops in the secondary coil equals the voltage in the primary coil divided by the voltage in the secondary coil if the volunteer attached to the primary coil read 100 volts what would the voltmeter attached to the secondary coil read