Which of the following examples are producing negative work upon an object? Select all that apply. a) an upward force is applied to an object to move it downward at a constant speed.
b) an downward force is applied to an upwardmoving object to slow it down as it moves.
c) an upward force is applied to an object to suspend it motionless in mid-air.
d) a force is applied to an object to hold it at rest on a ramp.
e) a rightward force is applied to an object to move it to the right at a constant speed. ​

Explain the difference between each pair of concepts. a. frequency and relative frequency b. percentage and relative frequency a. select the correct choice below. a. frequency is the total number of observations in a data set. relative frequency is the number of times a particular distinct value occurs. b. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of a value to the total number of observations. c. frequency is the total number of observations in a data set. relative frequency is the ratio of the number of times a particular distinct value occurs to the frequency. d. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of two different values.

The softest and hardest minerals are: softest hardest

The man of mass m1 and the woman of mass m2 are standing on opposite ends of the platform of mass m0 which moves with negligible friction and is initially at rest with s = 0. the man and woman begin to approach each other. derive an expression for the displacement s of the platform when the two meet in terms of the displacement x1 of the man relative to the platform.