A body of mass 2 kg is thrown vertically upwards with an initial velocity of 20 m/s. What will be its potential energy at the end of 2 s? (Assume g = 10 m/s 2 ).

Question

Philoid · Accepted Answer

Given,

Mass of the body, m = 2kg,

Initial velocity, (u) = 20 m/s,

Time, (t) =2s,

Acceleration due to gravity, g = 10 m/s.

Let the height at the end of 2s = d

We know that,

d = ut + 1/2at²

d = 20 x 2 + 1/2 x (-10) x (2)²

d = 40- 20

d = 20m

(g is taken as negative because it is acting in the direction opposite to the direction of motion)

Potential Energy, P.E = mgh

= 2 × 10 × 20

= 400 J.

A body of mass 2 kg is thrown vertically upwards with an initial velocity of 20 m/s. What will be its potential energy at the end of 2 s? (Assume g = 10 m/s2).

A body of mass 2 kg is thrown vertically upwards with an initial velocity of 20 m/s. What will be its potential energy at the end of 2 s? (Assume g = 10 m/s²).