A 1 kg ball is thrown upwards with a speed of 9.9 m/s. Calculate the work done
by its weight in one second.
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Given : a 1 kg ball is thrown upwards with a speed of 9.9 m/s
To Find : calculate the work done by its Weight in one second
Solution:
Initial Velocity = 9.9 m/s
a = g = - 9.8 m/s
V = U + at
Velocity after 1 sec = 9.9 + (-9.8)(1)
= 0.1 m/s
KE = Kinetic Energy
KE = (1/2)mV²
KE at initial = (1/2)*1(9.9)²
KE after 1 sec = (1/2)*1(0.1)²
Change in KE = (1/2)*1(0.1)² - (1/2)*1(9.9)²
= (1/2) ( 0.1 + 9.9)(0.1 -9.9)
= (1/2)(10)(-9.8)
= -49 J
Work Done = -49 J
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