Question

The work done in lifting a body through a distance of 120m is 5kw.calculate the mass of the body

Answer 1

Answer:

Answer:

Work done will be 90 J

Explanation:

We have given that mass of the object m = 5 kg

Distance s= 12 m

Time t = 4 sec

From second equation pf motion we know that

$12=0\times 4+\frac{1}{2}\times a\times 4^212=0×4+ 21 ×a×4^2$

$a=1.5m/sec^2a=1.5m/sec^2$

According to newton's law force is given by F = ma

So force $F = 5\times 1.5=7.5N5×1.5=7.5N$

We know that work done is given by W=$Fs=7.5\times12=90JW=Fs=7.5×12=90J$