1. If a 250 kg rock is sitting on the ledge of a cliff 295 meters high, then what is the potential energy of the rock?
2. A 275 kg rock is rolling faster and faster down the side of a mountain. At the bottom
of the mountain the rock has an instantaneous velocity of 3 m/s, at this moment what is
the kinetic energy of the rock?
3. A race car with a mass of 500 kg on a bridge 45 m above a river, what is the
potential energy of the car?
4. A race car with a mass of 500 kg is driving with an instantaneous velocity of 2.8 m/s,
what is the kinetic energy of the car?
5. Two blocks of wood with a mass of 0.02 kg are hanging 0.9 m above the floor, what
is the potential energy of the blocks of wood?
Mi

? you expect us to answer this? ? this is your schoolwork, i don't think we can with this, i think it would considering being

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer