Question

A train increases its speed steadily from 10m/s to 20m/s in 1 minute.
a) what is its average speed during this time in m/s?
b) how far does it travel while increasing its speed?

Answer 1

Answer:

1. 30m/s
2. 30km

Explanation:

average speed = intial velocity +final velocity/time

a.v = 10+20/1

a.v = 30m/s

distance=speed/time

s=30/1

s = 30 km

Answer 2

Answer:

a) 15 m/s

b) 900m

Explanation:

b) distance covered= area under the graph

area= distance = (sum of parallel sides)/2 × height

distance= (10 m/s + 20 m/s)/2 × 60s

distance= 900 m

a) Average speed= total distance/ time taken

A.V = 900m/60s

A.V = 15 m/s