ul. The passengers standing on a stationary bus fall backward when the bus suddenly moves forward.Give reasons.​

The law of inertia states objects have a tendency to resist a change in motion. Given that, when the bus moved forward abruptly, the passengers had a natural tendency to resist the change in motion. Since they weren't moving before, they fell back because they had a tendency to stay in their state of equilibrium.

The newton’s second law of motion states that force is directly proportional to acceleration. We can express this mathematically as:

F = k a

where F is the force acting on the object, a is the acceleration of the object and k is a constant of proportionality

Since k is a constant, then we can equate two conditions based on that value:

F1 / a1 = F2 / a2

We are given that:

F1 = 35 N

a 1 = 5 m/s^2

F2 = 49 N

a2 = unknown (?)

Therefore the new acceleration of the object is:

35 / 5 = 49 / a2

a2 = 49 * 5 / 35

a2 = 7 m/s^2

The new acceleration is 7 m/s^2.