Answer:
A truck has been slowing down uniformly at 100 km / hr. If for this you had to stop 1500 m. Calculate What deceleration caused the brakes?
Step-by-step explanation:
The truck is initially moving at 100km/hr
Then, the initial speed is
u = 100km/hr = 100×1000/3600
u = 27.778m/s
The truck travel a distance of 1500m before coming to rest.
Therefore, since the truck comes to rest, the final velocity is 0m/s
v = 0m/s
And the distance is
S= 1500m
Calculate deceleration a?
Using equation of motion
v² = u² + 2as
0² = 27.778² + 2 × a × 1500
0 = 771.6 + 3000a
-3000a = 771.6
a = 771.6/-3000
a = —0.257 m/s²
The negative sign is show that the car is decelerating, therefore, the deceleration is 0.257m/s²