Student Login

Home›Chapters›Motion in One Dimension PYQs›Motion Under Gravity›Question 50

NEET 2010 (AIPMT, Prelims) · Motion Under Gravity

Motion Under Gravity question from NEET 2010 (AIPMT, Prelims)

Q50NEET 2010 · AIPMT · PRELIMSMedium

Motion Under Gravity

A ball is dropped from a high rise platform at t = 0 starting from rest. After 6 seconds another ball is thrown downwards from the same platform with a speed v. The two balls meet at t = 18 s. What is the value of v?

(Take g = 10 m/s2)

Show answer and solution

Answer: (a)

First ball at $t = 18\text{ s}$ has fallen $\frac{1}{2}(10)(18)^2 = 1620\text{ m}$ .
Second ball moves for $18 - 6 = 12\text{ s}$ : $12v + \frac{1}{2}(10)(12)^2 = 12v + 720$
They meet: $12v + 720 = 1620 \Rightarrow v = 75\text{ m/s}$
So the answer is (a) 75 m/s.

Report a mistake

More questions on Motion Under Gravity

Consider a rubber ball freely falling from a height h = 4.9 m onto a horizontal elastic…JEE Main 2009 (AIEEE)
Two bodies A (of mass 1 kg) and B (of mass 3 kg) are dropped from heights of 16 m and 25…NEET 2006 (AIPMT)
A ball is thrown vertically upward. It has a speed of 10 m/sec when it has reached one…NEET 2005 (AIPMT)
A parachutist after bailing out falls 50 m without friction. When parachute opens, it…JEE Main 2005 (AIEEE)
A ball is released from the top of a tower of height h meters. It takes T seconds to…JEE Main 2004 (AIEEE)
A man throws balls with the same speed vertically upwards one after the other at an…NEET 2003 (AIPMT)
If a ball is thrown vertically upwards with speed u, the distance covered during the last…NEET 2003 (AIPMT)
From a building two balls A and B are thrown such that A is thrown upwards and B…JEE Main 2002 (AIEEE)