Question

7.If a net force of 5 N constantly applied on 200g object at rest how long will it take to rise its velocity to 150
m/s?​

Answer 1

Answer:

Time, t = 4.57 seconds

Explanation:

Given that,

Net force acting on the object, F = 7 N

Mass of the object, m = 400 g = 0.4 kg

Initial velocity of the object, u = 0

Final velocity of the object, v = 80 m/s

Let t is the time taken to reach its final velocity. The net force acting on the object is given by :

F = m a

F=m\times \dfrac{v-u}{t}F=m×

t

v−u

F=m\times \dfrac{v}{t}F=m×

t

v

t=\dfrac{mv}{F}t=

F

mv

t=\dfrac{0.4\times 80}{7}t=

7

0.4×80

t = 4.57 s

So, the time taken by the object is 4.57 seconds. Hence, this is the required solution.