CBSE Class 11-science Answered
A body of mass 500kg is thrown vertically upwards wiyh an initial speed of 200m/s. On the return journey its speed at the starting point will be? the options are
A) 2000m/s
B) 200m/s
C) 980m/s
D) 1000m/s
Asked by yasho1710 | 04 Sep, 2010, 08:36: AM
Expert Answer
the body's motion can be divided in two parts:
1. going up
2. returning back, down
Motion 1. Initial velocity , u = 200 m/s
Final velocity, v = 0 m/s (Velocity when it reaches the highest point is zero)
Acceleration, a = -10 m/s2 (since moving against gravity)
Using v2 = u2 + 2as,
Distance traveled in upward direction, s = 2000m
Motion 2. The body will trace back the 2000m to reach back to the starting point.
Therefore, s = 2000m
u = 0 m/s (velocity at highest point)
a = +10 m/s2 (moving along gravity)
Using v2 = u2 + 2as
v2 = 0 + (2x10x2000)
v = 200 m/s.
Answered by | 04 Sep, 2010, 11:55: PM
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