A weight W is now placed on the block and

7.7 N is needed to push them both at constant
velocity.
What is the weight W of the block?
Answer in units of N.

There must be a "part 1" to this question that contains vital omitted information, such as a coefficient of friction.

To find the weight W of the block, we need to use the given information about the force required to push the block and the total weight of the block with the additional weight.

We know that the force required to push the block and the weight together is 7.7 N. Let's denote the weight of the block as W_block and the weight added to it as W_added.

The equation we can use here is:

Force_push = W_block + W_added

We also know that the weight of an object is equal to the force of gravity acting on it, which can be calculated using the equation:

Weight = mass × acceleration due to gravity

Since weight is in newtons (N), we can then rewrite the equation as:

Weight = mass × 9.8 m/s^2

Using this information, we can calculate the weight of the block:

7.7 N = W_block + W_added

Now, since the additional weight (W_added) is not given, we cannot directly find the weight of the block. We need more information.