Question

A 5 Kg mass has an initial speed of 5m/s. After 3 sec, it has come to a speed of 70 m/s.

a. What is the acceleration of the mass?
b. What net force is acting on the mass during those 3 seconds?

Answer 1

a

`a = 21.7 \ m/s^2`

b

`F = 108.5 \ N`

Step-by-step explanation:

From the question we told that

The mass is m = 5 kg

The initial speed
`u = 5 m/s`

The time taken to attain
`v = 70 \ m/s` is t = 3 s

Generally from kinematic equation we have that

`v = u + at`

=>
`70 = 5 + a * 3`

=>
`a = 21.7 \ m/s^2`

Generally the force acting is mathematically represented

`F = m * a`

=>
`F = 5 * 21.7`

=>
`F = 108.5 \ N`