Question

a boy with mass 40 kg and kinetic energy 50 joules runs across the road calculate the velocity which Hi run​

Answer 1

Answer:

1.58 m/s (Approx) or (Underroot)2.5 m/s

Explanation:

By formula, we get KE= 1/2mv^2

Given that: KE= 50J, m= 40kg, v=?

Solution:

50=1/2*40*v^2

50=20*v^2

v^2= 50/20

v^2=5/2

v^2= 2.5

v= (underroot)2.5m/s or v= 1.58m/s Approx.