Question

[Warning Physics involved] The school bus with a total mass of 10 tonnes travels at a constant velocity of 40km/h down a long hill with a slope of 15 degrees. determine the braking force required to stop the bus within 50 metres from where the driver applies the brakes.

Answer 1

come on where my physicians at ?? :/

Answer 2

we know
F=ma
F=

Answer 3

m=10000kg

Answer 4

a=?

Answer 5

v^2=u^2-2as

Answer 6

wait

Answer 7

1/810 m/s^2????

Answer 8

idk that seems kind of dodgy to me ...?

Answer 9

yeah so we should square 3600 ?

Answer 10

initial velocity
u=40km/h=40*1000/3600m/s

Answer 11

now we know
v^2=u^2-2as
0^2=(100/9)^2-2a*50

Answer 12

now calculate acceleration a

Answer 13

now tell me the result for a

Answer 14

ok

Answer 15

11.1

Answer 16

ok

Answer 17

force F=ma=10000*11.1

Answer 18

111000? is that the final answer ?

Answer 19

it has another force which is a component of weight of ur bus

Answer 20

weight
F=10000*10
and component of weight along the way is
10000*10*cos 75

Answer 21

final force is
111000-10000*10*cos 75

Answer 22

calculate plz

Answer 23

111000-25881.9=85118.1