A 2000kg car experiences a braking force of 10000N and skids to a stop in 6 seconds. The speed of the car just before the brakes
were applied was A) 45 m/s
B) 15 m/s
C) 1.2 m/s
D) 30 m/s
E) none of these
So far I got a= 5m/s^2 and u= 30m/s but I think the answer is 45 m/s but I do not know where to go from there.
When vinegar and baking soda are first mixed together, hydrogen ions in the vinegar react with the sodium and bicarbonate ions in the baking soda. The result of this initial reaction is two new chemicals: carbonic acid and sodium acetate.
P=4800kgm/s As p=mΔv where p is momentum, m is mass and v is velocity Given values is m =1200kg Δv= 17m/s-13m/s=4m/s Now p=mΔv p=(1200kg)*(4m/s) p=4800kgm/s
