Blocks are initially at rest, now blocks are pushed by a 30 N force. Find work done by contact force between 8 kg & 2 kg block on the 2 kg block. during first 4 seconds.
A
+144 J
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B
-144 J
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C
+72 J
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D
-72 J
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Solution
The correct option is A +144 J W=Fscos0=(+ve)Fs sofblocks=12.a.t2=12.3×4×4=24m contact force on 2kg=m.a=2(3)=6 W=F.s.cos0=6×24×(+1)=+144J