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

Answer:

a

 $a = 21.7 \ m/s^2$

b

$F = 108.5 \ N$  

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

        $F = m * a$

=>      $F = 5 * 21.7$  

=>      $F = 108.5 \ N$