Question

a body of mass 2kg is thrown up at a velocity of 18 km/h. find the potential energy at the highest point

Answer 1

Answer:

30 J

Explanation:

M = 2kg

u = 18 kmph = 18 x 5/18 m/s = 5 m/s

v = 0 (At the highest point)

v = u + gt

0 = 5 + 10 t

t = 1/2 s

s = ut + 1/2 gt²

s = 5 x 1/2 + 1/2 x 10 x 1/4

s = 1.5 m

P.E = Mgs

= 2x1.5x10

P.E = 30 J