99 ! 3 questions! i! i! i question 1 which of the following accurately shows how to calculate the weight of a 20-kg object? 20 kg x mass of the earth 20 kg x 9.8 m/s2 20 kg / mass of the earth 20 kg / 9.8 m/s2 question 2 a greyhound's velocity changes from 10 meters per second to 15 meters per second in 0.5 second. what is the greyhound's average acceleration? 5 m/s2 10 m/s 10 m/s2 15 m/s question 3 a sprinter can go from a state of resting to running at 7 m/s in just 3 seconds. what is the sprinter's average acceleration? 2.3 m/s2 3 m/s2 6.9 m/s 21 m/s

Hope this helps!

I checked all his answers and they are all correct.

1. 20 kg*mass of the earth

2. 10 m/s2

3. 2.3 m/s2

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

answer: a tank of height h is filled with water and sits on the ground. water squirts from a hole at a height y above the ground and has a range r. for two y values, 0 and h, r is zero. determine the value of y for which the range will be a maximum.

explanation: