Question: A steel ball of mass 5 g is thrown downward with velocity 10 ms−1 from height 19.5 m. It penetrates sand by 50 cm. The change in mechanical energy will be (g = 10ms−2 )
(A) 1 J
(B) 1.25 J
(C) 1.5 J
(D) 1.75 J
Answer: Option (B)
Solution:
A steel ball of mass 5 g is thrown downward with velocity 10 ms−1 from height 19.5 m. It penetrates sand by 50 cm. The change in mechanical energy will be (g = 10ms−2 )
with
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