Question

38. (a) What is meant by the term 'acceleration' ? State the
(b) Define the term 'uniform acceleration'. Give one example of a uniformly accelerated motion.
39. The distance between Delhi and Agra is 200 km. A train travels the first 100 km at a speed of 50 km/h. How
fast must the train travel the next 100 km, so as to average 70 km/h for the whole journey?
40. A train travels the first 15 km at a uniform speed of 30 km/h; the next 75 km at a uniform speed of
50 km/h and the last 10 km at a uniform speed of 20 km/h. Calculate the average speed for the entire train​

Answer 1

Answer:

a ) acceleration is the rate of change of velocity with time , It is a vector quantity it can be positive negative and zero

It takes place only when the body is in non uniform motion

Answer 2

Answer:

a acceleration is the rate of change of velocity .

b if an object speed is increasing at a constant rate then we say it has a uniform acceleration. "baki I don't know"