A force (2i+j-k )N acts on a body, which is initially at rest. At the end of 20 s the velocity of the body is (4i+2j-2k ) ms^-1, then the mass of the body is

Question

Accepted Answer

Correct answer: B. (b) |F |=F= 4+1+1= 6v= 16+4+4= 24 Now ,F= dp dt=m ( v-ut ) where, m= mass of body ⇒ 6=m ( 24-020 ) ⇒m= 6 20 24=10 kg

$A force (2 i + j - k) N acts on a body, which is initially at rest. At the end of 20 s the velocity of the body is (4 i + 2 j - 2 k) ms^{- 1}, then the mass of the body is$

Solution

More Newton's Laws of Motion PYQs