ElectricPavlov

sqrt(100) / sqrt(25)  =  10/5 =2

F=ma

vf=vo + at     rearranging:  (vf-vo)/t = a    Substitute into the next equation

xf=xo+vot+1/2at^2

4.2 = 0 + 6.33(t) + 1/2 (2.38-6.33)/t  * t^2

4.2 = 6.33t + (-1.975)t

t=.964409 sec

(vf- vo)/t = a

(2.38-6.33 )/  t = a = -4.09577 m/s^2

F=ma = 1210 kg  (-4.09577 m/sec^2) =  - 4955.88 J   (negative because it is opposite to the motion of the coaster)

THAT is the form of an equation for a LINE  where m = slope and 'b' is the y-axis intercept. (where 'x' = 0)

Probably not at all as 1 BILLION people would likey be scattered all over the globe and their jumping forces would cancel out.

Easiest if eveything is in the same units....    1 ft = 12 inches

40ft(12inches/ft) x 1ft(12inches/ft) x 3ft(12 inches/ft) = 207360 cu inches

Each brick is 8x4x2=64 cu inches

Some bricks may need to be cut, (and assuming no mortar space)   207360 cu inches / (64 in^3/brick) = 3240 bricks

=a ^(5*3) = a^(15)

= (-3/8)^2 * (t^(2*2))

9/64 t^4

This is a right triangle> the string is the hypotenuse    the tree is one leg and the distance from you to the tree is the other leg.

 S-O-H  C-A-H  T-O-A        S-O-H   sin = opposite over hypotenuse  =  8/30

sin= 8/30

arcsin (8/30) = 15.47 degrees

You didn't tell us what  units  '.866025403784'  has...I will assume it is degrees

to convert to radians    :     degrees x pi/180 = radians = .015114995 radians

If 1/4 of the sweets are Toffees, then 3/4 are mints.

Let x= total sweets:     3/4 x = 21 mints     (solve for 'x')     then x = 21(4/3) = 28