Question
A car travels 120 km at a speed of 40 km/h and returns
at a speed of 60 km/h. Find the average speed of the car for the whole journey.Solution
Average speed = (2 * speed1 * speed2) / (speed1 + speed2). Substituting the given values, Average speed = (2 * 40 * 60) / (40 + 60) = 48 km/h. Correct answer: a) 48 km/h
If a body of mass 5 kg is raised to 10 meters height, find its potential energy. (g = 9.8 m/s²) Â
Find the power if a force of 100 N displaces an object by 10 m in 5 seconds.
A device used for converting A.C. into D.C. is called –
A ray of light is incident on a transparent medium at an angle of 60°. The reflected ray of light is found to be completely Q.4 polarized. Then, the r...
A stone of mass 0.08 kg is thrown vertically upwards. Give the direction and magnitude of the net force on the stone during its downward motion. Ignore ...
What is the momentum of an object of mass 1/2 m, moving with a velocity of 2V?
The emission of a beta-minus particle from a nucleus results in:
During which type of motion does an object along a straight line have zero change in velocity for any time interval?
What is the acceleration due to gravity on the Moon? Â
The shape of our Milky Way galaxy is
