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A certain force exerted for 1.2s …

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A certain force exerted for 1.2s raises the speed of an object from 1.8m/s to 4.2m/s . Later , the same force is applied for 2 second . How much does the speed change in 2s?

Posted by Ajay Dak 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 1 month ago

Here, t=1.2s,u=1.8m/s,v=4.2m/s
acceleration, a=(v−u)/ t = (4.2−1.8)/ 1.2 = 2.4/1.2 = 2m/s²
Now, a as force applied is the same, it will produce the same acceleration.
Change in speed=accelerationxxtime for which force is applied =2×2=4m/s

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