Henry, whose mass is 95 kg, stands on a bathroom scale in an elevator. the scale reads 830 n for the first 2.4 s after the elevator starts moving, then 930 n for the next 2.4 s. part a what is the elevator's speed 4.8 s after starting? express your answer with the appropriate units.
Given that they have contant speeds.
Let the speed of alice be v1 and that of bob be v2.
Given that v2=8 miles per hour
v1=10 miles per hour
It is given that alice crosses bob at a distance of 1 mile.
Time taken for alice to go 1 mile is 0.1 hours.
Distrance travelled by bob in this time is 0.8 miles.
So bob will have crosses 0.2 miles by the time alice starts running.
So head start of bob would be hours i.e.0.025 hours.
Decimal to the nearest tenth is 0.02 hours.
you started by expanding the bracket 3(2x+6) became 6x+18.\
Then you rearranged the equation so like terms were together.
You put brackets around the like terms so (27+18)+(6x+2x)
You added the first like terms (27+18)= 45
then you added the second like terms (6x+2x)= 8x