Q. 35.0( 2 Votes )

# A body of m

Answer :

Mass of body = 5kg = m

Initial speed = 10m/s = u

Kinetic energy = = × 5kg × (10m/s)2

= × 5 × 100

= 250J

Final speed = 0m/s (at highest point)

Using 3rd equation of motion.

v2 = u2 – 2gs

(0)2 = (10m/s)2 – 2(9.8m/s2) s

0 = 100 – 19.6s

–100 = –19.6s = s

5.102m = s = h

Potential energy = mgh

= 5 × 9.8 × 5.102

= 249.98J = 250J (approx.)

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