Question

An object of mass 40 kg is
raised to a height of 5m above the
ground. What is its potential
energy? If the object is allowed
to fall. Find it kinetic energy when it
is half way downs​

Answer 1

Answer: PE = 1960 Joule , 980 joule

Explanation: PE = mgh = (40)(9.8)(5) =1960 Joule

When it is half way down

-- by v^2 = u^2 + 2as

V = (2as)^1/2

= (2*9.8*2.5)^1/2

= 7 m/s

KE = (1/2)*mv^2 = (1/2)*40*49 = 980 joule