Answer:
a and c
Step-by-step explanation:
Answer:
x = 25
Step-by-step explanation:

Answer:
1800 J
Step-by-step explanation:
At point A when the cart is not in motion, it only has potential energy.
We know that potential energy is given by mgh where m is the mass of the cart, g is acceleration due to gravity and h is the height.
Substituting 12 kg for m, 10 m/s2 for g and 15 m for h then
PE= 12*10*15=1800 J
So, 10%-7%=3%=$294
$294/3%=$9800
Answer: The cost price of the necklace is $9800.