Answer:
Work done W =1406.25 J
Explanation:
Work done on a body can be calculated using newton's 2nd laws:
F=ma
[tex]\Rightarrow a=\frac{F}{m}[/tex]
Hence acceleration of the block is given by:
[tex]\Rightarrow a=\frac{25}{2}=12.5m/s^2[/tex]
Displacement of the object is given by:
[tex]\Rightarrow S=ut+\frac{1}{2}at^2[/tex]
Substitute the values
[tex]\Rightarrow S=0*3+\frac{1}{2}(12.5)3^2[/tex]
[tex]\Rightarrow S=56.25 m[/tex]
Now work done is given by:
W=F.S
W = 25×56.25
W =1406.25 J
