determine the time taken when: Q no. b distance=8 m, speed =8 2/5 cm/sec
Answers
Answer: 6.72m
Distance = 8m
Speed = 8 2/5 cm/sec = 5 x 8 + 2/5
= 42/5
To convert a number from cm/s to m/s, divide the digit by 10
After converting cm/sec to m/s
42/50
Speed = Distane/time
Time = Speed x Distance
Time = 42/50 x 8
= 42/25 x 4
= 168/25
= 6.72m
If you need the answer in cm, multiply the decimal by 10
6.72 x 10
= 67.2cm
Commonly Made Errors:
People forget to check the unit and apply the formula before converting all the units to the same unit.
Answering Tip:
Carefully read the question at least twice, write down all the values with the units on the paper and make sure all of them are in the same unit, if not then do apply the needed methods to convert them to the same. Make sure to go through the answer you have written to make sure there are no errors.