x – 1.2 = 3.6
The required percentage of Jenny's great-grandmother age is Jenny's age is 13%.
The percentage is defined as a ratio expressed as a fraction of 100.
For example, If Misha obtained a score of 67% on her exam, that corresponds to 67 out of 100. It is expressed as 67/100 in fractional form and as 67:100 in ratio form.
Jenny's great-grandmother is 90 years old and Jenny is 12 years old.
To calculate the percentage of Jenny's age compared to her great-grandmother's age, you can divide Jenny's age by her great-grandmother's age and then multiply by 100.
So, (12/90) × 100 = 13.33%.
However, the answer should be in exact percent with no decimal, so the answer is 13%.
Learn more about the percentages here:
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Answer:
Step-by-step explanation:
Let v be the speed after the collision of both the cars.
Now, momentum is given by: mass × velocity, then by equating the total momentum before and after the collision of the two cars, we get
⇒
⇒
⇒
Thus, they are moving at the velocity of
Answer:
0.5 m/s
Step-by-step explanation:
A 500 g model train car traveling at 0.8 m/s collides with a 300 g stationary car.
Initial velocity of train,
Initial velocity of car,
Mass of train,
Mass of car,
The cars hook up and move off down the track together.
Let the final velocity of car and train,
Using conservation of momentum,
Momentum before collision = Momentum after collision
Hence, After collision they will going with 0.5 m/s