Test Index

ICSE Class 10 Physics 2019 Solved Paper

Show Para  Hide Para 
SECTION - II

A body of mass 10‌Kg is kept at a height of 5 m . It is allowed to fall and reach the ground.
© examsnet.com
Question : 33
Total: 74
What is the total mechanical energy possessed by the body at the height of 2m assuming it is a frictionless medium?
Solution:  
At the highest position;
‌h=5m;m=10‌kg;g=10m∕ s2
‌∴‌‌‌ Potential Energy ‌(U1)=mgh
‌‌=10×10×5
‌‌=500J
Kinetic Energy (K1)=0 (∵‌ velocity ‌=0)
∴ Total mechanical Energy ‌=U1+K1
‌=500+0
‌=500J
At the height of 2m, the total mechanical energy will remain same as it was at the highest position. ( ∵U+K= constant, for a freely falling body)
∴ Total mechanical energy =500J
© examsnet.com
Go to Question:
Prev Question
Next Question