Question

A force of 2i+j-k Newtons acts on a body which is in rest. If the velocity of the body at the end of 20 seconds is 4i+2j-2k, the mass of the body is .................. .

Answer 1

Hey mate!

Here's your answer!!

The change in velocity = 4i + 2j + 2k

Time taken 20 sec.

So acceleration = 2/20 * ( 2i + j + k)

Let m be the mass,

Then m × a = F

So m/10 ( 2i + j + k) = 2i + j + k

===> m = 10 kg

$hope \: it \: helps \: you....$
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#BE BRAINLY

Answer 2

answer attached with above pick.


hope this helps you deaR ✌