A15.7 kg cart with negligible friction in its wheels is being pushed up a 22.0° hill (assume it’s basically an inclined plane) at a constant speed of 3.45 m/s. at some instant, the pushing stops and the cart is allowed to coast up the hill.

a) how much force is needed to keep the cart moving at the constant speed?

b) how far up the ramp will the cart travel after the pushing force is removed?

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.