SELECT * FROM question_mgmt as q WHERE id=4112 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=8 AND subId=16 AND chapterId=187 and ex_no='5' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 9th science Motion a trolley while going down an inclined plane has

Question:

A trolley, while going down an inclined plane, has an acceleration of 2 cm s-2. What will be its velocity 3 s after the start?

Answer:

Initial velocity of the trolley, u = 0

Acceleration, a = 2 cm s−2

Time, t = 3 s

According to the first equation of motion:

v = u + at

Where, v is the velocity of the trolley after 3 s from start

v = 0 + 2 × 3 = 6 cm/s

Hence, the velocity of the trolley after 3 s from start is 6 cm/s.

 


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