Physics-Uniform & Non-uniform Motion
NEET Physics Uniform & Non-uniform Motion MCQ Question
Type: MCQ-numerical-Easy-Class 11
A ball is thrown vertically upwards with an initial velocity of 20 m/s from a height of 25 m. Using the kinematic equation y = y0 + v0t + (1/2)at^2, how long does it take for the ball to reach the ground?
A
5 s
B
6 s
C
4 s
D
7 s
Correct Answer
Option A
Detailed Explanation
Using the equation y = y0 + v0t + (1/2)at^2 with y0 = 25 m, v0 = 20 m/s, a = -10 m/s^2, and y = 0 m, the quadratic equation 5t^2 - 20t - 25 = 0 is solved to find t = 5 s.
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