why does a child in a wagon seem to fall backward when you give the wagon a sharp pull forward? 15. what force is needed to accelerate a sled ( (mass 55 kg) at 1.4 m/s2 on hortzsontal ricti a 63 n b. 71n c 77 n 101 n

Force, F = 77 N

Explanation:

A child in a wagon seem to fall backward when you give the wagon a sharp pull forward. It is due to Newton's third law of motion. The forward pull on wagon is called action force and the backward force is called reaction force. These two forces are equal in magnitude but they acts in opposite direction.

We need to calculate the force is needed to accelerate a sled. It can be calculated using the formula as :

F = m × a

Where

m = mass = 55 kg

a = acceleration = 1.4 m/s²

F = 77 N

So, the force needed to accelerate a sled is 77 N. Hence, this is the required solution.

grav potential energy

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures