Question

The diagram shows an electric toy boat of mass 2.5 kg moving horizontally in still water with a
constant velocity of 1.8 m/s. The water provides a resistive force of 0.85 N on the boat.
toy boat
water
propeller
​
1.Forward force?
2.K.E

Answer 1

Answer:

There is only one force upon the ball - the force of gravity. (Air resistance is negligible; the ball is not on a surface, so there is no friction or normal force; the applied force which projects it into motion does not act upon the ball during its trajectory; there are no springs, strings, wires, or cables attached so there is neither a tension force nor a spring force.) The force of gravity acts downward with a magnitude of m•g = (0.250 kg) •(9.8 m/s/s) = 2.45 N. The net force is 2.45 N; when divided by mass, the acceleration can be found.

a = Fnet / m = (2.45 N, down) / (0.250 kg) = 9.8 m/s/s, down