Question

Find the force applied by block A on block B. (All the

surfaces are smooth)

(A) 10 N (B) 5 N

(C) 7 N (D) 15 N

Answer 1

Answer:7N

Explanation:

Net acceleration is net force /net mass

Ie 10-5/5

a=1

Now as 10 Newtons is greater

Body will move in the right direction

From 2nd law of newtons

10-f=3a where a=1

& f is contact force A on B let's say

f=7N

You can also write from 2nd body

f-5=3a where a=1

f=7N

Always focous 1st on net forces and accleration

Answer 2

Answer:

7N

Explanation: