(a)Why is luggage kept on the roof of the bus tied with a rope? (b)A car is moving at a velocity of 72 Km/h. Suddenly brakes are applied so as to stop the car after 10 m. Find the force exerted by the brakes on the car. (If the total mass of car and passengers is equal to 800 Kg).
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Luggage is tied on roof of bus because when bus suddenly stops the luggage continue to be in state of motion due to inertia of motion. So it can also harm someone so to prevent it. luggage is tied on roof of the bus
u = 72km/h = 20 m/s
v =0
s= 10m
v2 = u2 +2as
0 = 20^2 + 2× a×10
0 = 400+ 20a
-400= 20a
-400/20 = a
-20m/s^2 =a
mass= 800 kg
f=ma
800× -20
-16000N
u = 72km/h = 20 m/s
v =0
s= 10m
v2 = u2 +2as
0 = 20^2 + 2× a×10
0 = 400+ 20a
-400= 20a
-400/20 = a
-20m/s^2 =a
mass= 800 kg
f=ma
800× -20
-16000N
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