  In this paper, we carry out multiwavelength observations of three recurring
jets on 2014 November 7. The jets originated from the same region at the edge
of AR 12205 and propagated along the same coronal loop. The eruptions were
generated by magnetic reconnection, which is evidenced by continuous magnetic
cancellation at the jet base. The projected initial velocity of the jet2 is 402
km s. The accelerations in the ascending and descending phases of jet2 are not
consistent, the former is considerably larger than the value of solar
gravitational acceleration at the solar surface, while the latter is lower than
solar gravitational acceleration. There are two possible candidates of extra
forces acting on jet2 during its propagation. One is the downward gas pressure
from jet1 when it falls back and meets with jet2. The other is the viscous drag
from the surrounding plasma during the fast propagation of jet2. As a contrast,
the accelerations of jet3 in the rising and falling phases are constant,
implying that the propagation of jet3 is not significantly influenced byextra
forces.
