Question

A body travelling with uniform acceleration crosses 2 points a and b respex

Answer 1

A body travelling with uniform acceleration crosses two points A and B with velocities 20ms−1 and 30ms−1 respectively . The speed of the body at the mid-point of A and B is.

Answer : 25.5ms−1

302−202=2al,302−v2=2al2

302−202=2×302−2v2

or 2v2=2×302−302+202

=900+400=1300

or v2=650

or v=650−−−√ms−1

=25.5ms−1