Question

Three blocks of mass 1kg, 4kg,2kg are placed on a smooth horizontal plane as shown in figure. Then the
acceleration of the system is?
a)10 ms -2
c) 20 ms -2
b) 15 ms - 2
d) 5 ms - 2
​

Answer 1

Answer:

a) 10 m/s^2 is the correct answer

Explanation:

As shown in figure,

Resultant force is on the right direction and which is = 120-50= 70N

Now,combine three blocks and make one system whose mass = 1+4+2= 7 Kg

For,acceleration of system, a :-

F = ma

=> 70N = 7kg x a

=> a = 70/7 = 10m/s^2

So,acceleration of system is 10m/s^2.

Hope it helps

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