Please I want someone to answer it A ball falls freely for 1 second starting fro
ID: 1563900 • Letter: P
Question
Please I want someone to answer it
A ball falls freely for 1 second starting from rest. Neglecting air resistance, after 2 seconds (starting from rest) (a) Its acceleration will be two times greater. (b) It will fall twice as far. (c) Its speed will be four times greater. (d) It will fall four times as far. An ice skater gliding on smooth ice eventually slows down and stops because (a) Gravity does this. (b) Her inertia is responsible for slowing down. (c) Friction between her skates and the ice causes this. (d) All objects naturally slow down and stop after a while. You lift a large box from the floor and place it on a table. The amount of work you do (a) Depends equally on the weight of the box and the height of the table. (b) Depends only on the height of the table. (c) Depends primarily on the weight of the box. (d) Depends on fast you raise the box. You are water skiing and you travel in a straight line at constant speed with the boat exerting the force to pull you forward. In skiing this way (a) The water exerts a very small force on you. (b) There is no net force acting on you. (c) The net force on you is the pull of the boat. (d) You do not pull on the boat because there is no way for you to do that. While driving your car at constant speed on an interstate highway you round a long curve. (a) There is no acceleration because you travel at a constant speed. (b) The faster your speed, the smaller your acceleration. (c) The tighter the curve, the greater your acceleration. (d) The centrifugal force acting on your car keeps it on the highway.Explanation / Answer
1. H =u*t +1/2*g*t*t
u=0, at t=1sec, H=1/2*g
at t=2sec, H=1/2*g*4
Ans- (d) travel 4 times
2) Ans - (c) due to friction
3) Ans - (a) depend on weight and height
4) Ans (c) Net force is pull of boat
5) Ans - (c) tighter the curve, acceleration is more