Question

If your father raises a hammer that has a mass of 2kg at a distance of 0.5m to push a nail onto a piece of wood. how much work dond he actually do each time in lifting the hammer

Given:


unknown:


sulotion:


Final answer:​

Answer 1

Answer:

20N

Explanation:

mass (m)=1kg

Initial velocity (u) =2m/s

distance covered (s)= 0.01m

using (3)rd equation of motion

v2=u2=2as

∴ final velocity (v)=0 (nail does not move further)

0=(2)2+2a×(0.01)

a=−200m/s2

Force of impact i..e. applied by hammer

F=ma

=(1kg)(200m/s2)

F=200N

Now, using (1) st equation of motion

v=u+at

∵v=0

0=2+(−200)t

t=−200−2

t⇒10−2sec