A body of mass 5 Kg is raised vertically to a height of 10 m by a force of 170 - Physics - Work Energy and Power

Question

A body of mass 5 Kg is raised vertically to a height of 10 m by a
force of 170 N The final velocity of the body is A 15 m/s B 17 m/s
C 20 m/s D 22 m/s

Vaibhav T. · Accepted Answer

Dear Student,

Force, F=ma170=5aa=1705=34 m/s2But this acceleration has to overcome the acceleration due to gravity
 So,a'=a-ga'=34-10=24 m/s2Now, v2-u2=2asv2-02=2×10×24v2=480v=480=21
9 m/s

A body of mass 5 Kg is raised vertically to a height of 10 m by a force of 170 N. The final velocity of the body is A. 15 m/s B. 17 m/s C. 20 m/s D. 22 m/s