Question

A7 kg object is subjected to two forces (in newton):
F, = 20 î +30ſ and } =8î - 5j
The magnitude of resulting acceleration inms-2 will be​

Answer 1

Answer:

m=7kg

F

 

1

​  

=20  

i

^

+30  

k

^

 

F

 

2

​  

=8  

i

^

−5  

j

^

​  

 

The net force is equal to the sum of two force,

F

=  

F

 

1

​  

+  

F

 

2

​  

 

F

=20  

i

^

+30  

j

^

​  

+8  

i

^

−5  

j

^

​  

=28  

i

^

+25  

j

^

​  

 

Magnitude, ∣  

F

∣=  

(28)  

2

+(25)  

2

 

​  

=35N

Force, F=ma

a=  

m

F

​  

 

acceleration, a=  

7

37.5

​  

=5m/s  

2

.

The acceleration is 5m/s  

2

.

The correct option is A.

Explanation: