ICSE Class 10 Answered
exercise 2 q. 4
![question image](http://images.topperlearning.com/topper/new-ate/top_mob158814130046296426904f18cbe-1fd9-4032-820e-bc1fa35255c3.jpg)
Asked by nilesh.dhote74 | 29 Apr, 2020, 11:51: AM
(a) Mass of skier, m = 60kg
Consider g = 10 m/s2 ... (Given)
Loss in potential energy = mghA - mghB
mg(hA –hB)
=60 x 10 x(75 - 15)
= 60 x 10 x60=3.6x104J
(b)
![K i n e t i c space e n e r g y space a t space B space equals space 75 percent sign space cross times space 3.6 space cross times 10 to the power of 4
space equals space 75 over 100 space cross times space 3.6 space cross times 10 to the power of 4 space equals space 27000 space J
W e space k n o w comma space
K i n e t i c space e n e r g y space equals space 1 half m v squared space
H e n c e comma space
27000 space equals space 1 half space cross times space 60 cross times v squared space
v squared space equals space 27000 over 30 space equals space 900 space
v space equals space 30 space m divided by s space](https://images.topperlearning.com/topper/tinymce/cache/4fcc4fa0c2b7b54a4a141aabec67eef7.png)
Answered by Shiwani Sawant | 29 Apr, 2020, 13:45: PM
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