In a crash test, a truck with mass 2100 kg traveling at 22 m/s smashes head-on into a concrete wall without rebounding. the front end crumples so much that the truck is 0.62 m shorter than before.

(a) what is the average speed of the truck during the collision (that is, during the interval between the first contact with the wall and coming to a stop)?
(b) about how long does the collision last? (that is, how long is the interval between first contact with the wall and coming to a stop? )
(c) what is the magnitude of the average force exerted by the wall on the truck during the collision?
(d) it is interesting to compare this force to the weight of the truck. calculate the ratio of the force of the wall to the gravitational force mg on the truck. this large ratio shows why a collision is so damaging.
(e) what approximations were necessary in making this analysis? (select all that apply.)

a. neglect the horizontal component of the force of the road on the truck tires.
b. assume a nearly constant force exerted by the wall, so the speed changes at a nearly constant rate.
c. the deceleration of the truck is approximately equal to g.

Use the frequency histogram to complete the following parts. ​(a) identify the class with the​ greatest, and the class with the​ least, relative frequency. ​(b) estimate the greatest and least relative frequencies. ​(c) describe any patterns with the data. female fibula lengths 30.5 31.5 32.5 33.5 34.5 35.5 36.5 37.5 38.5 39.5 0 0.05 0.1 0.15 0.2 0.25 length (in centimeters) relative frequency a histogram titled "female fibula lengths" has a horizontal axis labeled "length in centimeters" from 30.5 to 39.5 in increments of 1 and a vertical axis labeled "relative frequency" from 0 to 0.25 in increments of 0.05. the histogram contains vertical bars of width 1, where one vertical bar is centered over each of the horizontal axis tick marks. the approximate heights of the vertical bars are listed as follows, where the label is listed first and the approximate height is listed second: 30.5, 0.02; 31.5, 0.04; 32.5, 0.05; 33.5, 0.13; 34.5, 0.22; 35.5, 0.25; 36.5, 0.13; 37.5, 0.06; 38.5, 0.09; 39.5, 0.01. ​(a) the class with the greatest relative frequency is nothing to nothing centimeters. ​(type integers or decimals. do not round. use ascending​ order.)

Question 11 of 13 (1 point) jump to question: a stairway, ladder, or ramp must be present in excavations in which of the following situations? a. all trenches must have access/egress b. the trench is more than 15 feet wide but only 1 ½ feet deep c. the trench is more than 4 feet deep and the devices must be within 25 feet of all workers

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