Question

A car starts from rest and under a constant accelerating force, it acquires a velocity of 3 m/s in 5 seconds. If
mass of a car and passengers be 1800 kg, calculate the magnitude of force.​

Answer 1

Explanation:

Initial velocity (u)= 0 m/s

Final velocity(v) = 3m/s

time = 5sec

by using v²= u² + 2as

3² = 2(5)a

or, a = 9/10 m/s²

by Newton's 2nd law

F = ma

F = 1800× 9/10

F = 1620N

Answer 2

Answer:

32.86

Explanation:

$u = 0(starts \: from \: rest) \\ v = 3 \frac{m}{s} \\ t = 5s \\ v = u + at \\ 3 = 0 + 5a \\ a = \frac{3}{5} \frac{m}{ {s}^{2} } \\ f = ma \\ f = 1800 \times \frac{3}{5} \\ f = 360 \times 3 \\ f = 1080 \: newton \\ magnitude \: of \: force = \sqrt{1080 } \\ magnitude \: of \: force \: = \: 32.86$