Question

i want easy explaination

Answer 1

Answer:

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(a) total negative velocity= 20m/s

total time= 10sec

total negative acceleration= 20/10

= 2m/s ANSWER:-

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Answer 2

Answer:

2 m/s^2. ; 400 m

Explanation:

Decrease in velocity starts from B and ends till the velocity becomes 0 ( at C ) in 40 - 30 second.

Therefore,

Negative acceleration = ( 20 - 0 ) / ( 40 - 30 ) m/s^2

Negative acceleration = 20 / 10 m/s^2

Hence negative acceleration is 2 m/s^2.

Between points A and B body travels in the same velocity. Considering the path as straight.

Thus,

= > Distance covered between 30th and 40th sec

= > velocity x time ( or area of the rectangle )

= > ( 20 - 0 )( 30 - 10 ) m

= > 20( 20 ) m

= > 400 m