Home › JEE Main › Physics › Motion in a Straight Line › As per your syllabus, a ball thrown upward at 20…
As per your syllabus, a ball thrown upward at 20 m/s from a height of 25 m (g=10 m/s², neglecting air resistance) takes how long to hit the ground?
A10 seconds
B3 seconds
C2 seconds
D5 seconds
Answer & Solution
Correct answer: D. 5 seconds
As per your syllabus, second method: y = y₀ + v₀t + ½at²
→ 0 = 25 + 20t − 5t²
We have → 5t² − 20t − 25 = 0 → t.
So → 5t² − 20t − 25 = 5 s.
Related questions
Which kind of motion did Domingo de Soto in 1545 correctly identify with uniformly accelerA cyclist moving at 10 m/s accelerates uniformly at 2 m/s^2 for 4 s. What is the final speHow many of the five SUVAT variables does each constant-acceleration equation of motion coA scooter starts from rest and reaches 20 m/s with a uniform acceleration of 5 m/s^2. WhatA train speeds up uniformly from 10 m/s to 30 m/s in 10 s. What is its acceleration?A bike moving at 20 m/s brakes with a uniform retardation of 4 m/s^2. How long does it takA car starts from rest and accelerates uniformly at 2 m/s^2 along a straight road. How farA body moves with constant velocity. Its acceleration is