3questions, 10 points a question, will give brainliest.
question 1: in which of these situations, is mechanical energy being conserved? (neglect, air resistance, friction and breaking) check all that apply.
question 1 options:

child on a swing

pendulum

bow and arrow

roller coaster

question 2: as an object falls to the ground, its potential energy is being converted to kinetic energy.

question 2 options:
true
false

question 3: calculate the potential energy stored in a 10 kg block, 5 meters above the ground.

question 3 options:

490 j

50 j

490 n

50 n

Texture and composition are different because they are not the same aspect. texture has to do with feel and so on, where as composition is the chemical makeup which you cant touch like you can texture.

Shy diving is the only sport which doesnot require a high level of physical fitness

Supply is the markets term for selling a specific quantity of products at various prices. the law of supply and demand is the one which affect the pricing and also the quantity the market is able to produce or make available.

Answer: a charge of -1.0  × 10⁻⁴ c must be placed  at x = 26 m.the sign of the charge will be the same sign as the  -4.0  µc charge.======electricstatic force between two point charges  is given by    where k is coulomb's constant,  8.99×10⁹  n·m²/c², q₁ and q₂ are the point charges, and r is the distance between the two point charges.assign positive to q₁let q₁ =  6.0 µc, q₂ = -4.0  µc, q₀ represent the charge at the origin, and q₃ represent this new charge to place.the charge at the origin q₀ would experience the following force f₀₁ from q₁, with r = 6.0 m (note that 1  µc = 10⁻⁶ c)    the force from q₂    the force from q₃    the net force on the origin charge, q₀, has to be zero for no electrostatic forcehaving an equation where k and q₀ can be divided out of the equation will allow us to solve for q₃    isolating:     a charge of -1.0  × 10⁻⁴ c must be placed  at x = 26 m.the sign of the charge will be the same as the  -4.0  µc charge