Question

The velocity of a body of mass 18 kg increases from 15 km/h to 20 km/h in 25 seconds . Calculate the value of external force acting on that body​

Answer 1

Answer:

Therefore, the value of the external force is 0.93 N

Explanation:

Here, mass = m= 18kg

initial velocity = u = 15 km/hr = 4.2 m/s

final velocity = v = 20 km/hr = 5.5 m/s

Therefore, F = m x a

F = m(v - u)/t [a = (v - u/t)]

F = 18(5.5 - 4.2)/25

F = 0.93 N