Question

If force=100N, mass=20kg, final velocity=50m/s, initial velocity=20m/s find time​

Answer 1

Given,  

Force, F = 100 N  

Mass of the body, m = 20 kg  

Therefore, Acceleration is given by,  

Acceleration, a = F/m = 100/20 5m/s^2  

Now, Initial velocity, u = 0  

Final velocity, v = 100 m/s  

Acceleration, a = 5m/s^2  

Therefore, Time for which the force is applied,  

t = v-u/a = 100 - 0/5  

= 20s

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Answer 2

Answer: 6 sec

Explanation:

F = ma

F= m(v-u) /t

100= 20(50-20) /t

100t= 20×30

100t = 600

t = 6 sec