Question

the velocity time graph of a moving object is shown below its displacement after 14 second is.


90m
50m
60m
80m ​

Answer 1

Answer:

Displacement is Area under Velocity - Time graph .

Explanation:

» Total Area till 14 seconds will show displacement.

Displacement = L × B + 1/2 × L × B + 1/2 × L × b + 1/2 × L × B + 1/2 × L × B

= ( 10 × 4 ) + ( 1/2 × 10 × 4 ) + ( 1/2 × -5 × 2 ) + ( 1/2 × -5 × 2 ) + 1/2 × 10 × 2

= ( 40 ) + ( 20 ) + ( - 5 ) + ( -5 ) + 10

Displacement = 60 m .

Answer 2

Answer: options b. 50m

Explanation:

Between time interval 20 s te 40 s, there is non-zero acceleration and retardation. Hence, distance travelled during this interval

= Area between time interval 20 s to 40s= 21 ×20×3+20×1=30+20=50m