As it is simple interest, you simply need to find what 4.5% of $2300 is, and then multiply this answer by 10. If it would have been compound interest, it would have been much more difficult. There are a number of ways that you can find out what 4.5% is, you can either divide $2300 by 100, and then multiply by 4.5, or you can find 1%, and multiply by 4.5. Personally, I think that doing it the first way is easier. $2300/100= 23. 23*4.5= $103.50 Therefore, the interest for 1 year is $103.50. In order to find what ten years is, you simply have to multiply this by 10. $103.50*10= $1035 To find the total value, you simply have to add the original investment ($2300) and the interest ($1035) together. $2300+$1035= $3335 Therefore, the total of the investment after 10 years is $3335.
The expression for the kinetic energy is mass times velocity squared over two
For the first question that gives us 2,25 joules
If the ball is at the given height then it has a further 60 Joules in potential energy.
Answer is D
