1. a=Δv/Δt=(v-vo)/t=(0-25)/5=-25/5=-5 m/s²
The "-" sign shows us that the car has a slow motion
2.a=Δv/Δt=(v-vo)/t=(10-0)/4=10/4=2,5 m/s²
3.they do not have acceleration because they go at constant speed
Answer:
Maximum speed of the car is 26.56 m/s.
Explanation:
Given that,
Mass of the car, m = 1200 kg
Radius of the curve, r = 90 m
The coefficient of friction between tires and the road is 0.8.
We need to find the maximum speed of the car. On the circular curve, the centripetal force is balanced by the force of friction. So,

So, the maximum speed of the car is 26.56 m/s.
Answer:
The chemist is incorrect because a catalyst increases the rate of reaction only.
Explanation:
A catalyst is a substance in the presence of which the speed of the reaction increases. It plays no role in the chemical change taking place.
Thus, if the two compounds are not chemically reacting, a catalyst wont make it happen either.
A chemical reaction occurs when atoms tend to lose or gain electrons. A catalyst has no role to play in this process.
Electrical energy is a particle that moves through a wire and transferred into homes, work, etc to make electricity work in objects.