A train covers 168 km in 4 hours. Find its speed.

Predict whether the changes in enthalpy, entropy, and free energy will be positive or negative for the boiling of water, and explain your predictions. how does temperature affect the spontaneity of this process?

Explain that newton first law,second law and third law of motion?

The footprints of a dinosaur and the burrow of an ancient shrimp are examples of which kind of fossils