A car starts from rest and accelerates at 5 m/s^2. At t = 4 s, a ball is dropped out of a window by a person sitting in the car.
0
15/09/2021 10:23 am
Topic starter
A car starts from rest and accelerates at 5 m/s2. At t = 4 s, a ball is dropped out of a window by a person sitting in the car. What is the velocity and acceleration of the ball at t = 6 s? (Take g = 10 m/s2)
(1) 20 m/s, 5 m/s2
(2) 20 m/s, 0
(3) 20√2 m/s, 0
(4) 20√2 m/s, 10m/s2
Answer
Add a comment
Add a comment
1 Answer
0
15/09/2021 10:27 am
The answer is (4) 20√2 m/s, 10m/s2
Explanation:
Velocity of car at t = 4 sec
v = u + at
v = 0 + 5(4)
= 20 m/s
At t = 6 sec
Acceleration is due to gravity
∴ a = g = 10 m/s
vx = 20 m/s (due to car)
vy = u + at
= 0 + g(2) (downward)
= 20 m/s (downward)
v = \(\sqrt{v_x^2 + v_y^2}\)
= \(\sqrt{20^2 + 20^2}\)
= 20√2 m/s
This post was modified 2 years ago by admin
Add a comment
Add a comment
Forum Jump:
Related Topics
-
The particle moving in a circle of radius R with a uniform speed takes a time T to complete one revolution. If this particle were projected with the same speed at an angle 'θ' to the horizontal, the maximum height attained by it equals 4R.
3 years ago
-
Two conducting circular loops of radii R1 and R2 are placed in the same plane with their centres coinciding. If R1 >> R2, the mutual inductance M between them will be directly proportional to:
3 years ago
-
From a circular ring of mass 'M' and radius 'R' an arc corresponding to a 90° sector is removed. The moment of inertia of the remaining part of the ring about an axis passing through the centre
3 years ago
-
A uniform conducting wire of length 12a and resistance 'R' is wound up as a current carrying coil in the shape of, (i) an equilateral triangle of side 'a'. (ii) a square of side 'a'.
3 years ago
-
A series LCR circuit containing 5.0 H inductor, 80 μF capacitor and 40Ω resistor is connected to 230 V variable frequency ac source.
3 years ago
Forum Information
- 321 Forums
- 27.3 K Topics
- 53.8 K Posts
- 3 Online
- 12.4 K Members
Our newest member: Stripchat
Forum Icons:
Forum contains no unread posts
Forum contains unread posts
Topic Icons:
Not Replied
Replied
Active
Hot
Sticky
Unapproved
Solved
Private
Closed