Acar travels 2.5 hours in a northern direction for 300km. determine the cats speed and velocity

Velocity = 120 km/h in north

Speed  =  120 km/h

Explanation:

Given data:

Distance = 300 km north

Time taken = 2.5 hr

Speed and velocity = ?

Solution:

Speed = distance / time

Speed  = 300 km / 2.5 h

Speed  =  120 km/h

Velocity = change in position / change in time

Velocity = 300 km north /  2.5 hr

Velocity = 120 km/h in north

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.