Concepts
- There is a relationship between speed, distance and time:
Speed = Distance / Time
or
Distance = Speed * Time
2 . Average speed = 2xy / x+yWhere x km/hr is a speed for certain distance and y km/hr is a speed at for same distance covered.
Rmemeber that average speed is not just an average of two
speeds i.e. x+y/2. It is equal to 2xy / x+y.
3. Always remember that during solving questions units must be same. Units can be km/hr, m/sec etc.
conversion of km/hr to m/sec and m/sec to km/hr
x km/hr = (x*5/18) m/sec i.e. u just need to multiply 5/18
Similarly, x m/sec = (x*18/5) km/sec
4. As we know, Speed = Distance/Time
Now, if in Questions Distance is constant then speed will be inversely proportional to time i.e. if speed increases, time taken will decrease and vice versa.
No comments:
Post a Comment