A boy throws a ball up in the air with a velocity of 9 m/s when they standing at the edge of a cliff 22 m high.
a) If the ball falls and lands at the base of the cliff, what is the velocity of the ball
when it lands?
b) How long was the ball in the air?

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

The electric potential a distance r from a small charge is proportional to what power of the distance from the charge? a. r^-1 b. r c. r^-2 d. r^2

7. see worksheet 1 for values of variables x1, x2 and x3 and answer the following questions: a. for each variable find the mean, median, coefficient of skewness, range and population standard deviation. b. compared to variable x1, how are the mean and median affected by extreme values (outliers) seen in x2 and x3. c. is the median or mean the better measure of location for x2 and x3? explain. d. explain the differences in the magnitudes of the skewness coefficients for the three variables. e. what is the relationship between the range and standard deviation looking across the three variables?