Question

??

Answer 1

both of these can be solved by applying

KE = (1/2)mv^2 and solving for the appropriate value

Answer 2

okay so for the first one it would KE=(1/2)(34)*8.5^2

Answer 3

right?

Answer 4

good

Answer 5

ke=1228.25

Answer 6

good, just don't forget units (joules)

Answer 7

okay and for the second one
KE=1/2*1150*27000^2

Answer 8

keep in mind that 27000 is the kinetic energy not the velocity

Answer 9

ohhh so what would i substitute for the v then

Answer 10

the question is asking you to solve for v so this is your unknown

Answer 11

so KE=1/2*1150*v^2

Answer 12

yup, solve that for v

Answer 13

575?

Answer 14

check your calculations again

Answer 15

okay

Answer 16

30

Answer 17

because i squared both sides. then i multiplied 1150*1/2 all under a sqrt

Answer 18

27,000 = (1/2)(1150)v^2

keep in mind the symbol only applies to the v

to isolate v^2 you must divide both sides by (1/2) and 1150 first and ~then~ take the square root

Answer 19

27

Answer 20

27,000/(1/2)/(1150) = ?

Answer 21

27,000 divided by (1/2) and then divided again by 1150 equals...?

Answer 22

49

Answer 23

47

Answer 24

because it is 46.9

Answer 25

good, that's your v^2 value, now find v

Answer 26

just sq it right?

Answer 27

other way around

it's already squared so you want to take the square root

Answer 28

6.9

Answer 29

good, 6.9 m/s. kind of a slow truck but the numbers work out.

Answer 30

cool thanks