The first 10 m of a 100 m dash are covered in 2 s by a sprinter who from rest and accelerates constantly. The remaining 90 m is run wit
same velocity the sprinter had after 2 s. In this context, answer the follo
questions.
Calculate the sprinter's constant acceleration during the first 2 s.
What is the sprinter's velocity after 2 s?
- Calculate the total time required to run the full 100 m.
1 Draw the displacement-time graph for the sprinter.
Classify the following situations as examples of balanced' and 'unbala
orces.
Two forces of 20 N acting towards left.
accelerating nlane

Modify the equation fδt=δ (mv) to find the force of friction.

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.

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.