If we drop an object, it's initial velocity is zero. How far will it fall in time 't'?
Correct answer: B. 4.9 t2
- A. 9.8 t2
- B. 4.9 t2
- C. 0.49 t2
- D. 98 t2
Explanation
Free fall is a motion of a body in which the only force acting of the body is the Gravitational Force. In this motion body moves with constant acceleration i.e acceleration due to gravity.When an object is thrown downward from a non zero height say h the motion is referred to as free fall with initial velocity of object beign zero.Hence v = 0By using the kinematics straight line motion formula : s= u +½ at2 s= 0 + ½ x 9.8x t2 s= 4.9 t2
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Force and Motion
Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
Practise Force and Motion
1,416 free Force and Motion MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Force and Motion questions
The slope of distance - time graph will always give:
A ball of mass 2 kg travelling at 8 ms-1 strikes a ball of mass 4kg travelling at 2ms-1. Both balls are moving along the same straight line as shown. After collision, both balls move at the same velocity v. What is the magnitude of the velocity V?
A car starts from rest and moves with a constant acceleration. During the 5th second of its motion, it covers a distance of 36 meters. What is the acceleration of the car?
Which one of the following is a non-conservative force?
A car is travelling in a straight line along a highway at a constant speed of 80miles per hour for 10 seconds. Find its acceleration.
An object with an initial velocity of 40m/s moves along a straight axis under constant acceleration. Three seconds later,its velocity is 14m/s. How far did it travel during this time?