3. if a horse gallops at a speed of 25 km/hr for 30 minutes, how far will it go? 4. if the horse in question…
3. if a horse gallops at a speed of 25 km/hr for 30 minutes, how far will it go? 4. if the horse in question 3 decided to run in a complete circle for those 30 minutes and ended where it started, what is its velocity? acceleration 1. what is the acceleration of a car in m/s² that increases its velocity from 0 m/s to 30 m/s in the span of 10 seconds? 2. what is the acceleration of a car driving straight along the highway at 30 m/s for 10 seconds? 3. a car decreases its velocity (using the brakes) at a rate of -1.2 m/s² for a time of 5 seconds. if the car ends up traveling at 5 m/s, how fast was it initially going? 4. what are the three controls in a car that can accelerate it? (the brakes and the emergency brake are essentially the same thing)
Answer
3.
Explanation:
Step1: Convert time to hours
30 minutes = 0.5 hours
Step2: Use distance - speed formula
The formula for distance $d=v\times t$, where $v = 25$ km/hr and $t = 0.5$ hr. So $d=25\times0.5 = 12.5$ km
Answer:
12.5 km
4.
Brief Explanations:
Velocity is a vector quantity which has both magnitude and direction. Since the horse ends where it started, its displacement is 0. Velocity $v=\frac{\text{displacement}}{\text{time}}$. With displacement = 0, the velocity is 0.
Answer:
0
Acceleration 1.
Explanation:
Step1: Use acceleration formula
The acceleration formula is $a=\frac{v - u}{t}$, where $u = 0$ m/s, $v = 30$ m/s and $t = 10$ s. $a=\frac{30 - 0}{10}=3$ m/s²
Answer:
3 m/s²
Acceleration 2.
Brief Explanations:
Since the car is driving at a constant speed of 30 m/s for 10 seconds, there is no change in velocity. Acceleration $a=\frac{\Delta v}{t}$, and $\Delta v=0$. So the acceleration is 0.
Answer:
0 m/s²
Acceleration 3.
Explanation:
Step1: Use the formula $v=u+at$
We know $v = 5$ m/s, $a=- 1.2$ m/s² and $t = 5$ s. Rearranging the formula for $u$ gives $u=v - at$.
Step2: Substitute values
$u=5-(-1.2\times5)=5 + 6=11$ m/s
Answer:
11 m/s
Acceleration 4.
Brief Explanations:
The three controls in a car that can accelerate it are the gas pedal (which increases the speed), the gear - shift (which can change the power output and thus affect acceleration), and the cruise - control (which can maintain or change a set speed, effectively accelerating in some cases).
Answer:
Gas pedal, gear - shift, cruise - control