First slide

The 3 equation for uniform acc

Question

A particle is moving along a straight line PQR with constant acceleration. It crosses the point P with a velocity of 5 m/s and the point R with a velocity of 25 m/s. If QR = 2(PQ), find the velocity with which if crosses the point Q

Moderate

A
10 m/s
B
7 m/s
C
15 m/s
D
20 m/s

Solution

$v^{2} = 5^{2} + 2 (P Q) a . . . . . . . . . . . . . (1) a n d 25^{2} = v^{2} + 2 (2 \times P Q) a . . . . . . . . . . . . . . (2) S o l v i n g, v = 15 m / s$

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